Is +12V @ 26A good for a X1900XT/XTX?

GLD · Aug 19, 2006

I am thinking it's time to upgrade my video card. I have a single card board and a PC Power & Cooling Silencer 470 ATX PSU w/26A on the +12V rail. I hear/read people recommend 30A or more on the +12V rail for the X1900's. If I have to upgrade to a 510 or 610 PC Power & Cooling PSU I could swing it, but what do you guys think about my current psu being up to the task? :respect:

Dippyskoodlez · Aug 19, 2006

Plenty strong. It'll run fine. My friends using a 450w psu thats nowhere near the capacity of that pc power and cooling on an x1900 fine.

JC316 · Aug 19, 2006

I wouldn't take the chance. I would go for at least 30A on the 12V rail. I fully reccomend the Antec smart power 2.0 500W.

giorgos th. · Aug 19, 2006

the best way to find it out is,someone from here with a X1900XT/XTX open the 3d box and see what amps the card is using.in stock and o/ced speeds.

Dippyskoodlez · Aug 19, 2006

JC316 said:
I wouldn't take the chance. I would go for at least 30A on the 12V rail. I fully reccomend the Antec smart power 2.0 500W.

A PC power and cooling 470 I guarantee will smoke an antec 500w.

savor_of_filth · Aug 19, 2006

+12V single or dual rail??

minimum req for 1900 all variant = 24A @+12v (single rail...)

JC316 · Aug 19, 2006

Dippyskoodlez said:
A PC power and cooling 470 I guarantee will smoke an antec 500w.

That maybe be true, but it still only has 26A on the 12V rail, my Antec has 36A. I mean, he may be alright with it, but it's still only 30 watts over required.

Dippyskoodlez · Aug 19, 2006

JC316 said:
That maybe be true, but it still only has 26A on the 12V rail, my Antec has 36A. I mean, he may be alright with it, but it's still only 30 watts over required.

No, you arent factoring in PSU design.

a pc power and cooling 470 isnt just a regular 470w psu... its the best of the best.. it would take a much stronger antec to compete with it..

its not he may be alright, he should be fine. That PSU is a tank. :pimp:

Companys have to give a "required spec" that factors in average psu's. This is a top notch psu that i guarantee can probably hold MUCH more than its own rating. letalone its rating!

GLD · Aug 19, 2006

Thanks for the info. guys. Nice to see the 24A number, so I am covered.
I am partial to the PC Power & Cooling psu's. It's the brand I will stick with for my main rig.
TPU has good people here. Thanks

Ketxxx · Aug 20, 2006

That 24A your told the card needs is JUST for the card more than likely, on top of that you have to consider power draw off the 12v rail for your other main components (mobo, cpu, hdd, fans...) If everything is at stock you should be able to get away with it. Everything overclocked to the max? Forget it. Nomatter which way you go though 26A is skating by the skin of your teeth really, a good system these days should have at least 34A on its +12v rail.

Dippyskoodlez · Aug 20, 2006

Ketxxx said:
That 24A your told the card needs is JUST for the card more than likely, on top of that you have to consider power draw off the 12v rail for your other main components (mobo, cpu, hdd, fans...) If everything is at stock you should be able to get away with it. Everything overclocked to the max? Forget it. Nomatter which way you go though 26A is skating by the skin of your teeth really, a good system these days should have at least 34A on its +12v rail.

Seeing as he's looking on advice for PSU's, I think theres a better of a chance he isnt overclocking to the max

GLD · Aug 20, 2006

In regards to a dual +12V psu, doesn't the +12V2 line supply the 4 pin plug for the cpu, and the other +12V1 rail supplies all other +12V components in the system? So a 36A combined does not have the ability to supply the video card anywhere near the 36A, but only the max of the +12V1. :confused:

GLD · Aug 20, 2006

Dippyskoodlez said:
Seeing as he's looking on advice for PSU's, I think theres a better of a chance he isnt overclocking to the max

Just a 25% oc' on my cpu. No oc' on my X850XT and most likely no oc' on new video card.

Ketxxx · Aug 20, 2006

Current PSU u have should be fine then, if things do start to go awol though, chances are your PSU is struggling.

g12rxz · Aug 20, 2006

I would say everything will work fine... the old XC Cube I had was an OC'd 3700+ with an x1900gt and 2 gigs of ram, all ran everything stable off of a 275watt psu. Not saying that it was smart, but it all worked just fine.

savor_of_filth · Aug 20, 2006

26A +12V rail = 1900 all variant and mild overclocking = prime stable

largon · Aug 20, 2006

Ketxxx said:
That 24A your told the card needs is JUST for the card more than likely, on top of that you have to consider power draw off the 12v rail for your other main components (mobo, cpu, hdd, fans...)

Wait, are you actually claiming a single X1900 card alone would require 26A*12V=288 watts? :shadedshu
A single X1900XT @ stock takes needs than 10A from the 12V rail.

Ahh, but of course, Mushkin is a PSU builder...

i_am_mustang_man · Aug 20, 2006

pcp&c psus are the bomb (ie they have nuclear power, except it's in a box!!)

seriously tho, i wouldn't worry about it. that psu won't blow on you, if anything there will be instability, and then time to get a new one. but i would be interested in just how many pcp&c psu's have destroyed a rig. i'm betting single digits..

JC316 · Aug 20, 2006

largon said:
Wait, are you actually claiming a single X1900 card alone would require 26A*12V=288 watts? :shadedshu
A single X1900XT @ stock takes needs than 10A from the 12V rail.

Ahh, but of course, Mushkin is a PSU builder...

Kett is right, my X1800GTO REQUIRES at least 26A on the 12V rail.

largon · Aug 20, 2006

JC316 said:
Kett is right, my X1800GTO REQUIRES at least 26A on the 12V rail.

Err, Ketxxx said the card alone would require 288W, this simply is not possible.

The amperage ATi recommends for the PSU's 12V rail are for the total output of the PSU's 12V combined with the absolute maximum power consumption of the most power hungry system one could possibly use with the particular card (something like a stock Pentium D 820 @ >130W).

It's a fact that high end PSU's nearing 1kW are 99% overcompensatory.

g12rxz · Aug 20, 2006

Aye, you'd need a pc using all the sata ports, full up on ide drives, full up on pci devices and usb stuff, a heck-uv-a-lotta ram, overclocked to the max and always running at 100% load to ever need that much power....

savor_of_filth · Aug 20, 2006

g12rxz said:
Aye, you'd need a pc using all the sata ports, full up on ide drives, full up on pci devices and usb stuff, a heck-uv-a-lotta ram, overclocked to the max and always running at 100% load to ever need that much power....

LOL...

Ketxxx · Aug 20, 2006

largon said:
Wait, are you actually claiming a single X1900 card alone would require 26A*12V=288 watts? :shadedshu
A single X1900XT @ stock takes needs than 10A from the 12V rail.

Ahh, but of course, Mushkin is a PSU builder...

not for idle or desktop use, but more than likely close to 160w for the card alone, look i'll even provide a random google linky I'll go one better too, i'll find something detailed

ed- here ya go, not too far off my estimate for idle\2d stuff, but in full 3d its well over 300w power draw, see for yourself Here

largon · Aug 20, 2006

Ketxxx,
PCIe VGA specification absolute maximum power draw is 150W (PCIe 16x slot: 75W + optional onboard 12V connector: 75W) thus 300W+ power draw for one card is not possible. And as a matter of a fact the 330W for X1900XTX from the Anandtech article you linked is not the consumption of the X1900XTX but the consumption of the whole system (nVidia nF4 mobo, FX-55, 1GB OCZ 2-2-2-6 DDR400, Seagate 7200.7 120GB, OCZ 600W PowerStream), including even the losses in power conversion of the PSU.

Josh Venning said:

we measure the total watt usage of our test computer at the wall outlet

Click to expand...

edit:
[rough estimate]
"Real" consumption of the X1900XTX is as follows:
Wall socket power draw (W): 337W
Efficiency of a OCZ PowerStream 600W: 70%, thus power draw of components with PSU excluded: 0.70 * 337W = 236W

Substract the FX-55 (~80W): 236W - 80W = 156W
minus RAM + HDD: 156W - 25W = 131W
minus mobo, which leaves only the VGA: 121W - 20W = 111W

X1900XTX ~111W = 9.25A @ 12V
[/rough estimate]

Ketxxx · Aug 20, 2006

meh, didnt notice that just flicked for an article with idle and load numbers. but my point stands, VCs use a lot of wattage, and that goes up moreso when its clocked.

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Is +12V @ 26A good for a X1900XT/XTX?

GLD

Dippyskoodlez

JC316

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giorgos th.

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GLD

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