W1zzard
12-11-2007, 08:21 PM
[PAGE=Introduction & Packaging]
Introduction
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/logo.jpg
I would like to thank Zalman (http://www.zalman.co.kr) for supplying the test sample.
Specifications from manufacturer
Dual Heatpipes Installed for Maximum Cooling Performance and Ultra-Quiet Operation
Module Sleeved Cables
Ultra Quiet 140mm Fan
Standby Noise Filter Switch
Six Independent +12VDC Outputs
Four PCI Express VGA Power 6-Pin & 6+2 Pin Connectors
Improved Power Factor & Reduced Harmonics through Active PFC
High Efficiency Design and 80 PLUS Certified
EZ Grip Connectors for ODDs & HDDs
Supports ATX12V CPU 4-Pin and EPS12V CPU 8-Pin
Gold-Plated Terminals & 16AWG Wires
Multiple Safety Features
WEEE & RoHS
International Safety and EMC Certifications
Packaging
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package1_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package1.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package2_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package2.jpg)
Zalman's package is huge and comes with a carrying handle to carry your loot back home. The front and back both have a nice listing of the important specifications so you actually know what you are buying.
Box contents:
Power supply unit
Power Cord
Instruction Manual
Cables
Zip ties, screws
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/contents_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/contents.jpg)
<table class="resulttable" border="1" cellspacing="0" cellpadding="5">
<tr>
<th rowspan="2">Connectors</th>
<th align="center">Main Power</th>
<th align="center">5.25"</th>
<th align="center">Floppy</th>
<th align="center">4 Pin CPU</th>
<th align="center">SerialATA</th>
<th align="center">PCI-E Aux Power</th>
</tr>
<tr>
<td align="center">ATX 20+4 Pin</td>
<td align="center">13</td>
<td align="center">2</td>
<td align="center">2</td>
<td align="center">12</td>
<td align="center">2x 6 + 2x 8</td>
</tr>
</table>
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/cablelength.gif
[page=The PSU]
The PSU
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu1_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu1.jpg)
The back of the PSU does not have a power switch which is a major limitation to me. Very often you want to completely turn off your PC to conserve power. Also this can be handy in case of a catastrophic failure when your watercooling is leaking for example.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu3_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu3.jpg)
On the other side we can see that Zalman uses a combination of fixed and modular cables. The important connectors like ATX power and +12V for the CPU as well as two VGA power connectors and a HDD cable are fixed. This makes sense to me because those cables will almost certainly be used, giving you an optimum power delivery. Should you need more than those you can attach them to the PSU. This solution ensures that your case inside can stay very clean. The switch you can see here is to enable a "standy noise supressor". I can't see any reason why you would not want this on at all times.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu4_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu4.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu2_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu2.jpg)
Zalman's ZM 1000-HP power supply is longer than the ATX standard size, the exact length is 21 cm.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu5_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu5.jpg)
A big, slow running 140 mm fan will make sure your PSU stays cool at all times.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/atx_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/atx.jpg)
The motherboard connector supports both 20 and 24 pin operation. Unfortunately it is not possible to clip both parts together for easy installation in limited spaces.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/12v_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/12v.jpg)
This PSU comes with support for both 4-pin and 8-pin power connectors. If your board supports only four pin CPU power, leave the other one unconnected. This connector can not be clipped together either.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/pcie_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/pcie.jpg)
The two of the PCI-Express power connectors can either be used a 6 pin or 8 pin variant.
[pagE=PSU Inside & Test Equipment]
PSU Inside
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/warranty_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/warranty.jpg)
A little sticker covers one of the screws required to open the PSU case. If it is damaged, Zalman will not RMA your PSU in case of a defect.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside1_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside1.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside2_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside2.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside3_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside3.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside4_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside4.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside5_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside5.jpg)
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fan_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fan.jpg)
Test Equipment
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/setup.jpg
The PSU is connected to an APC SmartUPS which supplies clean 220V input.
AC current is measured using a Peaktech 4010 desktop RS232 multimeter with 0.02A accuracy.
To measure DC output voltages of the PSU we use a Keithley 2700 6.5 digit data acquisition system. All three input voltages are measured at the same time using a solid state switching system.
Power Factor is measured using a generic Power Efficiency Meter.
Measurements for Ripple Voltage were obtained using a 100 MHz Tektronix TDS224 Digital Storage Oscilloscope.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/noisetest_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/noisetest.jpg)
Fan noise measurements are performed with an IEC Type 2 Sound level meter and this setup.
It consists of three high-power resistors and a Socket A motherboard. The motherboard creates a small load which makes sure the PSU turns on (some PSUs require a minimum load). Since there is no hardware installed in the motherboard, its power draw is negligible. The three resistors create a static load of 320W (120W @ 12V + 50W @ 5V + 150W @ 12V) - a typical high-performance system. This setup is also used to determine the power conversion efficiency of the PSU.
[page=Performance]
Performance
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/sticker_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/sticker.jpg)
<table class="resulttable" border="1" cellspacing="0" cellpadding="5">
<tr>
<th colspan="12">Zalman ZM1000-HP </th>
</tr>
<tr>
<th>AC Input</th>
<td colspan="11">100V-240V, 8A-15A, 50-60 Hz</td>
</tr>
<tr>
<th>DC Voltage</th>
<td align="center">+3.3V</td>
<td align="center">+5V</td>
<td align="center">+12V1</td>
<td align="center">+12V2</td>
<td align="center">+12V3</td>
<td align="center">+12V4</td>
<td align="center">+12V5</td>
<td align="center">+12V6</td>
<td align="center">+5VSB</td>
</tr>
<tr>
<th rowspan="3">Max. Output </th>
<td align="center">40A</td>
<td align="center">40A</td>
<td align="center">18A</td>
<td align="center">18A</td>
<td align="center">28A</td>
<td align="center">28A</td>
<td align="center">18A</td>
<td align="center">18A</td>
<td align="center">3.5A</td>
</tr>
<tr>
<td colspan="2" align="center">250W</td>
<td colspan="6" align="center">960W</td>
<td align="center">17.5W</td>
</tr>
<tr>
<td colspan="9" align="center">1000W</td>
</tr>
</table>
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psugraph.gif
Tested on: AMD Athlon64 FX-62 @ 2800 MHz, ABIT AT8, 2x 512 MB DDR400, WD Raptor 36 GB, Radeon X1900 XTX + Radeon X1900 XTX Crossfire
Voltage stability on all lines is very good, especially the 12V line is among the best we've ever seen in our testing. The 3.3V line fluctuates a little bit more but is still very stable.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/ripple.jpg
The ripple voltage looks good as well, with an amplitude of 16 mV from top to bottom.
<table class="resulttable" border="1" cellspacing="0" cellpadding="5">
<tr>
<th>Standard deviation 12V</th>
<td align="right">6.04</td>
</tr>
<tr>
<th>Standard deviation 5V</th>
<td align="right">3.89</td>
</tr>
<tr>
<th>Standard deviation 3.3V</th>
<td align="right">8.87</td>
</tr>
<tr>
<th>Power Factor</th>
<td align="right">0.99</td>
</tr>
<tr>
<th>Ripple Voltage 12V</th>
<td align="right">16.0 mV</td>
</tr>
<tr>
<th>Power Efficiency @ 320 W</th>
<td align="right">83% (320W:386W)</td>
</tr>
</table>
Standard deviation is a statistical term, which tells how far away from the average the measurements are. In other words it's the average of the average.
A large standard deviation indicates that the data points are far from the average and a small standard deviation indicates that they are close within the average.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/efficiency.gif
Compared to the Zalman ZM850-HP that we tested recently, the efficiency has gone up by around 2% bringing this PSU even closer to the top ranked competition products. The high efficiency means that less power is converted into heat in the PSU, so the fan can run slower and quieter.
[PAGE=Fan Noise]
Fan Noise
For easier comparison of PSU fan noise results we have separated our test results into three groups with a chart each:
Up to 500W: Typical PSU ideal for a single video card system.
500W to 750W: Plenty of power available for most single and dual video card machines.
Over 750W: For the most hardcore, power hungry and overclocked setups.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fannoise_500.gif http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fannoise_750.gif http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fannoise_1000.gif
Just like the 850W model, the ZM-1000HP is extremely quiet. In both idle and load it will probably be quieter than the rest of your PC components. Even in a quiet room with a silent PC you can barely hear the fan running. This means that this PSU could even be used for a powerful media PC that allows you to watch HD content and play the latest games without breaking a sweat.
[page=Value & Conclusion]
Value and Conclusion
<table width="100%" cellpadding="5" cellspacing="0" id="result">
<tr><th>http://www.techpowerup.com/images/dollar.gif</th>
<td>
Zalman is asking around $295 for the ZM-1000HP.</td>
</tr><tr>
<th>http://www.techpowerup.com/images/thumbup.gif</th>
<td>
Extremely quiet
1000W of power
Stable output voltages
Large number of connectors
Modular
Six 12V rails
Cables are fully sleeved
3 Year warranty
</td>
</tr>
<tr>
<th>http://www.techpowerup.com/images/thumbdown.gif</th>
<td>
High price
No power switch
Longer than ATX standard
</td></tr>
<tr><th>9.7</th>
<td>If your Christmas shopping list includes a power supply and money is not a problem, then go get the Zalman ZM-1000HP now! But only if you can live without a power switch. This and the longer size are the only two shortcomings I can find with this unit. I don't understand why Zalman has added a useless "standby filter" switch but no power switch, which costs something in the neighbourhood of 2 cents to implement.<br />
During all our tests the ZM-1000HP could deliver excellent results. The choice to go both fixed and modular cable gives you the best of both worlds: High quality power and no cable clutter to keep your case inside clean. Even though the form factor is a bit bigger, most cases which actually need a 1000W PSU should have plenty of space to accommodate this power supply.<br />
In case your budget is a bit smaller, you can also go with the ZM850-HP which we reviewed here (http://bios.techpowerup.com/reviews/Zalman/ZM850-HP/). It is essentially the same unit just with 850W and a smaller price tag (and still no power switch). The fan noise, or lack of it, is one of the properties you will love most once you one of these new Zalman power supplies. Personally I am using the ZM850-HP in my system and would never go back to a louder PSU.
</td></tr>
<tr><th></th><td>http://www.techpowerup.com/images/editorschoice.gif</td></tr>
</table>
Introduction
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/logo.jpg
I would like to thank Zalman (http://www.zalman.co.kr) for supplying the test sample.
Specifications from manufacturer
Dual Heatpipes Installed for Maximum Cooling Performance and Ultra-Quiet Operation
Module Sleeved Cables
Ultra Quiet 140mm Fan
Standby Noise Filter Switch
Six Independent +12VDC Outputs
Four PCI Express VGA Power 6-Pin & 6+2 Pin Connectors
Improved Power Factor & Reduced Harmonics through Active PFC
High Efficiency Design and 80 PLUS Certified
EZ Grip Connectors for ODDs & HDDs
Supports ATX12V CPU 4-Pin and EPS12V CPU 8-Pin
Gold-Plated Terminals & 16AWG Wires
Multiple Safety Features
WEEE & RoHS
International Safety and EMC Certifications
Packaging
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package1_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package1.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package2_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/package2.jpg)
Zalman's package is huge and comes with a carrying handle to carry your loot back home. The front and back both have a nice listing of the important specifications so you actually know what you are buying.
Box contents:
Power supply unit
Power Cord
Instruction Manual
Cables
Zip ties, screws
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/contents_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/contents.jpg)
<table class="resulttable" border="1" cellspacing="0" cellpadding="5">
<tr>
<th rowspan="2">Connectors</th>
<th align="center">Main Power</th>
<th align="center">5.25"</th>
<th align="center">Floppy</th>
<th align="center">4 Pin CPU</th>
<th align="center">SerialATA</th>
<th align="center">PCI-E Aux Power</th>
</tr>
<tr>
<td align="center">ATX 20+4 Pin</td>
<td align="center">13</td>
<td align="center">2</td>
<td align="center">2</td>
<td align="center">12</td>
<td align="center">2x 6 + 2x 8</td>
</tr>
</table>
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/cablelength.gif
[page=The PSU]
The PSU
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu1_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu1.jpg)
The back of the PSU does not have a power switch which is a major limitation to me. Very often you want to completely turn off your PC to conserve power. Also this can be handy in case of a catastrophic failure when your watercooling is leaking for example.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu3_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu3.jpg)
On the other side we can see that Zalman uses a combination of fixed and modular cables. The important connectors like ATX power and +12V for the CPU as well as two VGA power connectors and a HDD cable are fixed. This makes sense to me because those cables will almost certainly be used, giving you an optimum power delivery. Should you need more than those you can attach them to the PSU. This solution ensures that your case inside can stay very clean. The switch you can see here is to enable a "standy noise supressor". I can't see any reason why you would not want this on at all times.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu4_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu4.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu2_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu2.jpg)
Zalman's ZM 1000-HP power supply is longer than the ATX standard size, the exact length is 21 cm.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu5_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psu5.jpg)
A big, slow running 140 mm fan will make sure your PSU stays cool at all times.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/atx_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/atx.jpg)
The motherboard connector supports both 20 and 24 pin operation. Unfortunately it is not possible to clip both parts together for easy installation in limited spaces.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/12v_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/12v.jpg)
This PSU comes with support for both 4-pin and 8-pin power connectors. If your board supports only four pin CPU power, leave the other one unconnected. This connector can not be clipped together either.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/pcie_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/pcie.jpg)
The two of the PCI-Express power connectors can either be used a 6 pin or 8 pin variant.
[pagE=PSU Inside & Test Equipment]
PSU Inside
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/warranty_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/warranty.jpg)
A little sticker covers one of the screws required to open the PSU case. If it is damaged, Zalman will not RMA your PSU in case of a defect.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside1_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside1.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside2_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside2.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside3_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside3.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside4_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside4.jpg) http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside5_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/inside5.jpg)
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fan_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fan.jpg)
Test Equipment
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/setup.jpg
The PSU is connected to an APC SmartUPS which supplies clean 220V input.
AC current is measured using a Peaktech 4010 desktop RS232 multimeter with 0.02A accuracy.
To measure DC output voltages of the PSU we use a Keithley 2700 6.5 digit data acquisition system. All three input voltages are measured at the same time using a solid state switching system.
Power Factor is measured using a generic Power Efficiency Meter.
Measurements for Ripple Voltage were obtained using a 100 MHz Tektronix TDS224 Digital Storage Oscilloscope.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/noisetest_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/noisetest.jpg)
Fan noise measurements are performed with an IEC Type 2 Sound level meter and this setup.
It consists of three high-power resistors and a Socket A motherboard. The motherboard creates a small load which makes sure the PSU turns on (some PSUs require a minimum load). Since there is no hardware installed in the motherboard, its power draw is negligible. The three resistors create a static load of 320W (120W @ 12V + 50W @ 5V + 150W @ 12V) - a typical high-performance system. This setup is also used to determine the power conversion efficiency of the PSU.
[page=Performance]
Performance
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/sticker_small.jpg (http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/sticker.jpg)
<table class="resulttable" border="1" cellspacing="0" cellpadding="5">
<tr>
<th colspan="12">Zalman ZM1000-HP </th>
</tr>
<tr>
<th>AC Input</th>
<td colspan="11">100V-240V, 8A-15A, 50-60 Hz</td>
</tr>
<tr>
<th>DC Voltage</th>
<td align="center">+3.3V</td>
<td align="center">+5V</td>
<td align="center">+12V1</td>
<td align="center">+12V2</td>
<td align="center">+12V3</td>
<td align="center">+12V4</td>
<td align="center">+12V5</td>
<td align="center">+12V6</td>
<td align="center">+5VSB</td>
</tr>
<tr>
<th rowspan="3">Max. Output </th>
<td align="center">40A</td>
<td align="center">40A</td>
<td align="center">18A</td>
<td align="center">18A</td>
<td align="center">28A</td>
<td align="center">28A</td>
<td align="center">18A</td>
<td align="center">18A</td>
<td align="center">3.5A</td>
</tr>
<tr>
<td colspan="2" align="center">250W</td>
<td colspan="6" align="center">960W</td>
<td align="center">17.5W</td>
</tr>
<tr>
<td colspan="9" align="center">1000W</td>
</tr>
</table>
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/psugraph.gif
Tested on: AMD Athlon64 FX-62 @ 2800 MHz, ABIT AT8, 2x 512 MB DDR400, WD Raptor 36 GB, Radeon X1900 XTX + Radeon X1900 XTX Crossfire
Voltage stability on all lines is very good, especially the 12V line is among the best we've ever seen in our testing. The 3.3V line fluctuates a little bit more but is still very stable.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/ripple.jpg
The ripple voltage looks good as well, with an amplitude of 16 mV from top to bottom.
<table class="resulttable" border="1" cellspacing="0" cellpadding="5">
<tr>
<th>Standard deviation 12V</th>
<td align="right">6.04</td>
</tr>
<tr>
<th>Standard deviation 5V</th>
<td align="right">3.89</td>
</tr>
<tr>
<th>Standard deviation 3.3V</th>
<td align="right">8.87</td>
</tr>
<tr>
<th>Power Factor</th>
<td align="right">0.99</td>
</tr>
<tr>
<th>Ripple Voltage 12V</th>
<td align="right">16.0 mV</td>
</tr>
<tr>
<th>Power Efficiency @ 320 W</th>
<td align="right">83% (320W:386W)</td>
</tr>
</table>
Standard deviation is a statistical term, which tells how far away from the average the measurements are. In other words it's the average of the average.
A large standard deviation indicates that the data points are far from the average and a small standard deviation indicates that they are close within the average.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/efficiency.gif
Compared to the Zalman ZM850-HP that we tested recently, the efficiency has gone up by around 2% bringing this PSU even closer to the top ranked competition products. The high efficiency means that less power is converted into heat in the PSU, so the fan can run slower and quieter.
[PAGE=Fan Noise]
Fan Noise
For easier comparison of PSU fan noise results we have separated our test results into three groups with a chart each:
Up to 500W: Typical PSU ideal for a single video card system.
500W to 750W: Plenty of power available for most single and dual video card machines.
Over 750W: For the most hardcore, power hungry and overclocked setups.
http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fannoise_500.gif http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fannoise_750.gif http://www.techpowerup.com/reviews/Zalman/ZM1000-HP/images/fannoise_1000.gif
Just like the 850W model, the ZM-1000HP is extremely quiet. In both idle and load it will probably be quieter than the rest of your PC components. Even in a quiet room with a silent PC you can barely hear the fan running. This means that this PSU could even be used for a powerful media PC that allows you to watch HD content and play the latest games without breaking a sweat.
[page=Value & Conclusion]
Value and Conclusion
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Zalman is asking around $295 for the ZM-1000HP.</td>
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Extremely quiet
1000W of power
Stable output voltages
Large number of connectors
Modular
Six 12V rails
Cables are fully sleeved
3 Year warranty
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High price
No power switch
Longer than ATX standard
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<tr><th>9.7</th>
<td>If your Christmas shopping list includes a power supply and money is not a problem, then go get the Zalman ZM-1000HP now! But only if you can live without a power switch. This and the longer size are the only two shortcomings I can find with this unit. I don't understand why Zalman has added a useless "standby filter" switch but no power switch, which costs something in the neighbourhood of 2 cents to implement.<br />
During all our tests the ZM-1000HP could deliver excellent results. The choice to go both fixed and modular cable gives you the best of both worlds: High quality power and no cable clutter to keep your case inside clean. Even though the form factor is a bit bigger, most cases which actually need a 1000W PSU should have plenty of space to accommodate this power supply.<br />
In case your budget is a bit smaller, you can also go with the ZM850-HP which we reviewed here (http://bios.techpowerup.com/reviews/Zalman/ZM850-HP/). It is essentially the same unit just with 850W and a smaller price tag (and still no power switch). The fan noise, or lack of it, is one of the properties you will love most once you one of these new Zalman power supplies. Personally I am using the ZM850-HP in my system and would never go back to a louder PSU.
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