GeForce 8800 GS/GT/GTS Voltmods

quadomatic · Sep 15, 2008

Thanks for linking me to this thread Largon.

I bought the eVGA 9600GSO Dual Slot edition ($47 on newegg right now!!!), and so I'm going to go ahead and try this mod. Is it worth doing even if I'll be using the default dual slot cooler? Also, what variable resistors should I buy? I found these on radioshack (I could order from mouser, but with shipping it would be cheaper just to get them from radioshack)?

Errr...I'm guessing I'd need to order them on mouser.com or something. Radioshack doesn't carry resistors of the proper resistance for this.

Here are some resistors, would these work?

500 ohm potentiometer for GPU volt mod
http://www.mouser.com/Search/ProductDetail.aspx?qs=/zPWuUUsT7MBOUWHGrcugA==

20 Kohm potentiometer for memory volt mod
http://www.mouser.com/Search/ProductDetail.aspx?qs=m0BA540hBPd%2bnXSkPPJiaQ==

50 Kohm potentiometer for reverse voltage memory mod
http://www.mouser.com/Search/ProductDetail.aspx?qs=2jxZDUMdHjixhK9QkzGa9g==

4.7 Kohm potentiometer for OCP:
http://www.mouser.com/Search/ProductDetail.aspx?qs=3eDEvvxjZ0B2E6V7iiNcag==

OR (wasn't sure which to go with)

2.0 Kohm potentiometer for OCP:
http://www.mouser.com/Search/ProductDetail.aspx?qs=yLGXVRudD3ptg/FCghk3hw==

Thanks

jeanpieterse · Sep 16, 2008

Hi Largon,

Tell me, In stead of using this mod what do u think about using NiBiTor..? Because u can also change your voltage on NiBiTor.. Someone said that it does't work.. But why does my frame rate change when i adust the voltage in my bios with NiBitor..?
I'm no expert on this, so just want your opinion..

Thanks!

largon · Sep 16, 2008

quadomatic said:
Is it worth doing even if I'll be using the default dual slot cooler?

The mods will definitely gain you some MHz. Especially for shader domain clock which gives the most significant performance gain.

quadomatic]Also said:
this[/URL] for vGPU, this for vMEM and this for reverse vMEM. Note that reverse vMEM mod is useful only if your card has GDDR3 made by Qimonda. OCP mod is not needed unless you were using exotic cooling such as phase change, etc. If you absolutely insist on doing OCP too use this set at 4kΩ.

Before ordering the parts make sure your 9600GSO looks the same as in this guide.

quadomatic said:

How much of an oc could I probably get with the dual-slot air cooler? What cooler should I buy to replace it if I want better results (would it be worth it to replace the cooler?)?

Click to expand...

Sorry, my knowledge of GPU air cooling is very limited as I've been watercooling my GPUs for years now.

quadomatic said:

900/1135/2250 would probably be pushing it on air, huh?

Click to expand...

I think it's rather safe to say 900MHz core and 2250MHz shaders gaming stable are not going to happen on air cooling. Even on water it would require a lucky card.

quadomatic said:

Someone said this on newegg about the card:

Low stock fan speed and high temps. Idle was around 55C, load at 75C with stock clocks. At 700/1500/1000 with fans at 100%, 53C load temp.

Click to expand...

Is that good or bad?

Click to expand...

700/1500/1000 should be perfectly doable on stock air and stock voltages. Infact, I'd expect a couple hundred MHz more than 1500MHz for the shader OC on stock cooling & stock volts.

jeanpieterse said:

Tell me, In stead of using this mod what do u think about using NiBiTor..? Because u can also change your voltage on NiBiTor..

Click to expand...

As far as I know, the maximum voltage one can get via a BIOS mod is 1.15v.

jeanpieterse said:

Someone said that it does't work.. But why does my frame rate change when i adust the voltage in my bios with NiBitor..?

Click to expand...

Changing the voltage does not by itself increase the performance thus any change in fps cannot be due to any voltage tweaks one does into the card's BIOS.

quadomatic · Sep 16, 2008

Thanks a bunch largon! I'll be looking into this then once I get my card.

BUCK NASTY · Sep 17, 2008

quadomatic said:
Thanks a bunch largon! I'll be looking into this then once I get my card.

FYI, the EVGA 9600GSO Dual Slot has a different PCB design/layout than the single slot 8800GS/9600GSO. IMHO, it is a slightly weaker design/performance.

quadomatic · Sep 17, 2008

BUCK NASTY said:
FYI, the EVGA 9600GSO Dual Slot has a different PCB design/layout than the single slot 8800GS/9600GSO. IMHO, it is a slightly weaker design/performance.

Crap...does that mean I won't be able to volt mod it? Or that I would have to figure out how to (might as well mean I can't...or maybe I could)?

DOM · Sep 18, 2008

quadomatic said:
Crap...does that mean I won't be able to volt mod it? Or that I would have to figure out how to (might as well mean I can't...or maybe I could)?

just take the cooler off and take some naked pics of it like I did on the Palit 9600 GSO thread those are my pics if you didnt know, largon know his stuff

BUCK NASTY · Sep 18, 2008

quadomatic said:
Crap...does that mean I won't be able to volt mod it? Or that I would have to figure out how to (might as well mean I can't...or maybe I could)?

I have 2x 9600GSO dual slot's folding 24/7 and they score about 5-10% lower than the 8800GS. If there is a volt mod that would help the shader output, I'm onboard! I just ordered 2 more 9600GSO single slot's, as they are identical PCB to the 8800GS, thus better performance.

DOM · Sep 18, 2008

BUCK NASTY said:
I have 2x 9600GSO dual slot's folding 24/7 and they score about 5-10% lower than the 8800GS. If there is a volt mod that would help the shader output, I'm onboard! I just ordered 2 more 9600GSO single slot's, as they are identical PCB to the 8800GS, thus better performance.

yes there should be a volt mod just post some pics for largon he should know what you need to do

cuz the shaders run off the core volts

I was getting like 6-7k with one card but im never on vista that much so thats why i havent folded in a while :eek:

quadomatic · Sep 18, 2008

DOM said:
just take the cooler off and take some naked pics of it like I did on the Palit 9600 GSO thread those are my pics if you didnt know, largon know his stuff

Cool. I probably won't receive the card till some time next week though (paid newegg by money order, proly will end up shipping by monday or tuesday next week, so i'd get it by next friday). If pictures haven't been posted by then I'll try taking the cooler off. Hopefully it's not an incredibly difficult task to put take off and put back on. It wasn't real difficult with my X850 Pro, but then, that wasn't a dual slot cooler.

Despite all the relatively risky (while actually not very risky at all) modding I've done with my current system, it seems to have paid off fairly well (Pentium Dual Core E2200+fsb locked motherboard+2GB Ram+HyperTX 2 Cooler for less than $100, cpu overclocked to 3Ghz by BSEL and vCore mod). This will be a nice cheap addition, proving that you can in fact play games on a computer well for very, very cheap.

If I can handle Grand Theft Auto IV in November on my system with high settings, no AA at 1280x1024, I will be incredibly pleased.

quadomatic · Sep 23, 2008

My 9600GSO is supposed to come in this Thursday. I'll try to get pictures posted then.

quadomatic · Nov 1, 2008

Hey all, life has been fairly busy, and I was a bit fearful of taking off the cooler from my dual-slot eVGA 9600GSO. But, since I don't have a whole lot of time for gaming at this very moment (hopefully that'll change soon) I pulled my 9600GSO from my computer to take the cooler off and take some pictures. I'm running on my Intel integrated GMA950 right now...yikes.

I tried to take as good pics as I could. The images are fairly high resolution (3072x2304), and in total all the pictures weigh in at almost 20MB, so I zipped them up and uploaded them to filedropper.

It seems like I could overclock this card quite a bit. Without the volt mod, it runs at 752 mhz core/1806 mhz shader/1050 mhz memory. When I took the cooler off I found that the memory chips are Samsung, not the qimonda chips that were mentioned as being questionable earlier (though I don't know anything about the Samsung chips).

For $34, it definitely seems like I'm getting my money's worth. Fallout 3 runs beautifully, as does most every other game I've tried (Crysis is a bit questionable, but that's to be expected).

So, if someone could have a look at these pictures and tell me what I can do for a volt mod, I'd appreciate it:

http://www.filedropper.com/9600gso

Thanks a bunch!

quadomatic · Nov 7, 2008

So...has anyone taken a look?

quadomatic · Nov 10, 2008

bump?

infrared · Nov 10, 2008

Google !!

http://www.xtremesystems.org/forums/showthread.php?t=196707

Since this thread is for 8800 series graphics cards, you would have recieved a response faster by making a new thread

quadomatic · Nov 10, 2008

Ummm, yeah...

The reason I posted the pictures is because the eVGA card doesn't have the same PCB layout as any of the other cards out there, which is why I needed someone to look at the pictures I posted of my card.

Since my card has been sitting outside of my PC for about a week, and I've been using my integrated intel chipset for vga, if I thought finding a solution was as easy as Google, I would've found it already.

infrared · Nov 10, 2008

Ok, my bad.

Lemme take a look. The voltage control chips should be pretty much the same.

edit: your link doesn't work

quadomatic · Nov 11, 2008

infrared said:
Ok, my bad.

Lemme take a look. The voltage control chips should be pretty much the same.

edit: your link doesn't work

DARNIT

I'll find a better host.

DOM · Nov 11, 2008

quadomatic said:
DARNIT

I'll find a better host.

http://www.techpowerup.org/

File extensions allowed: gif, jpg, png, maximum size: 2 MB

quadomatic · Nov 11, 2008

There, they've been uploaded to Imageshack...I had to reduce quality of the images from 89 to 85 in GIMP though.

I do wonder if the "N88GT-LF REV: 1.2" printed on the front of the PCB would help at all.

Back:

Zoomed (Left, Center, Right):

Front:

Zoomed (Left, Center, Right):

infrared · Nov 11, 2008

Interesting lay-out.

The voltage control chip (for the gpu at least) is the RT8802A chip on the front-right of the board.

http://www.alldatasheet.com/datasheet-pdf/pdf/207883/RICHTEK/RT8802A.html

I'll have a quick look through the datasheet, but it's been a long time since i did electronics at college. Anyone feel free to jump in if you figure it out.

EDIT:

If you have a conductive pen you could do a VID voltmod which would be quicker and easier than using a pot. See pages 5-6 for the VID voltage table. Basically you set the gpu voltage by removing SMR's and bridging gaps.

quadomatic · Nov 11, 2008

infrared:

Thanks for taking a look. I really appreciate it.

If anyone needs better pictures of any specific part of the pcb, let me know.

quadomatic · Nov 11, 2008

Hmmm, I don't really know what the VID-Table says. Is it just that if there's resistance on some pins and none on others then the voltage will be different? So, I'd match up the resistor placement with the 0's being no resistor, 1's meaning yes there's a resistor, and the output at the end of the chart is the voltage I'd get?

If I took too high of a voltage, then wouldn't I be kinda screwed since I wouldn't be able to put the resistors back?

WOW, the picture makes those soldering points look big. Those resistors are absolutely tiny. I'm not sure how I'd go about removing those.

Just as a size comparison, I put a penny next to the chip. Those points are TINY.

infrared · Nov 11, 2008

You've got it. They basically ground out the pin, which would be a 0 on the VID table. If we can find a vmeasure point for the vgpu we can verify that.

To remove them you can heat them with a soldering iron while lifting them with a fine pair of tweezers. I used to just crush them with needle-nose pliers lol. Use conductive ink to re-connect the pads. To make it more permanent when you have the desired voltage you can spray over the area with a conformal coating to protect it. Comes in an aerosol can you can get at any electrical shop.

Ok, working from the table, if you 'open' the connection (1), the effect would be:

VID 6 = +0.00625
VID 5 = -0.01250
VID 4 = -0.40000
VID 3 = -0.20000
VID 2 = -0.10000
VID 1 = -0.05000
VID 0 = -0.02500

Hmm, I'll drop Solaris17 a PM. He should be able to help figure out a bit more.

I'm off for the night (3:10am here lol). I'll take another look tomorow after work. Hopefully we can figure out a Vmeasure point, and then maybe the vmod for the memory.

quadomatic · Nov 11, 2008

Cool, sounds good.

Just to check, how are we able to tell which side of the chip is facing "up", so we know which pins are the vid pins?

Also let me know if you need me to read off the names on any other chips. I notice the names on the ones on the back aren't that visible.

System Name	Fry's combo rockin' the BSEL
Processor	E2200 @ 2.93ghz BSEL & 1.55vCore Mod
Motherboard	ECS 945GCT-M/1333 v3.0 mATX
Cooling	Cooler Master Hyper TX2 + OCZ Freeze
Memory	3 GB DDR2 (1GB HP 667mhz, 2GB Corsair Dominator, "Functionality Untested", $13 on ebay)
Video Card(s)	eVGA 9600GSO @ 741/1836/1053
Storage	Hitachi Deskstar 1TB SATA 3.0Gb/s
Display(s)	Big 'ol CRT
Case	$5 Banged up piece o' shit from TigerDirect liquidation center
Audio Device(s)	Creative Sound Blaster X-Fi XtremeMusic
Power Supply	hec ORION 585Watt PSU
Software	Vista Ultimate x64

System Name	Ladpot ◦◦◦ Desktop
Processor	R7 5800H ◦◦◦ i7 4770K, watercooled
Motherboard	HP 88D2 ◦◦◦ Asus Z87-C2 Maximus VI Formula
Cooling	Mixed gases ◦◦◦ Fuzion V1, MCW60/R2, DDC1/DDCT-01s top, PA120.3, EK200, D12SL-12, liq.metal TIM
Memory	2× 8GB DDR4-3200 ◦◦◦ 2× 8GB Crucial Ballistix Tactical LP DDR3-1600
Video Card(s)	RTX 3070 ◦◦◦ heaps of dead GPUs in the garage
Storage	Samsung 980 PRO 2TB ◦◦◦ Samsung 840Pro 256@178GB + 4× WD Red 2TB in RAID10 + LaCie Blade Runner 4TB
Display(s)	HP ZR30w 30" 2560×1600 (WQXGA) H2-IPS
Case	Lian Li PC-A16B
Audio Device(s)	Onboard
Power Supply	Corsair AX860i
Mouse	Logitech MX Master 2S / Contour RollerMouse Red+
Keyboard	Logitech Elite Keyboard from 2006 / Contour Balance Keyboard / Logitech diNovo Edge
Software	W11 x64 ◦◦◦ W10 x64
Benchmark Scores	It does boot up? I think.

System Name	Fry's combo rockin' the BSEL
Processor	E2200 @ 2.93ghz BSEL & 1.55vCore Mod
Motherboard	ECS 945GCT-M/1333 v3.0 mATX
Cooling	Cooler Master Hyper TX2 + OCZ Freeze
Memory	3 GB DDR2 (1GB HP 667mhz, 2GB Corsair Dominator, "Functionality Untested", $13 on ebay)
Video Card(s)	eVGA 9600GSO @ 741/1836/1053
Storage	Hitachi Deskstar 1TB SATA 3.0Gb/s
Display(s)	Big 'ol CRT
Case	$5 Banged up piece o' shit from TigerDirect liquidation center
Audio Device(s)	Creative Sound Blaster X-Fi XtremeMusic
Power Supply	hec ORION 585Watt PSU
Software	Vista Ultimate x64

System Name	Main Rig
Processor	AMD FX-4130 @ 4.8Ghz
Motherboard	ASUS M5A99X Evo
Cooling	Coolermaster Hyper 212+
Memory	8GB GSkill DDR3 1600
Video Card(s)	ASUS GTX 970 Strix @ 1503Mhz Core
Storage	Corsair Force 90gb SSD/ WD Caviar Blue 750gb
Display(s)	ASUS 24" IPS
Case	Coolermaster Centurion 590
Audio Device(s)	Onboard
Power Supply	Antec TP750 80+
Software	Windows 7 Ultimate 64

System Name	Fry's combo rockin' the BSEL
Processor	E2200 @ 2.93ghz BSEL & 1.55vCore Mod
Motherboard	ECS 945GCT-M/1333 v3.0 mATX
Cooling	Cooler Master Hyper TX2 + OCZ Freeze
Memory	3 GB DDR2 (1GB HP 667mhz, 2GB Corsair Dominator, "Functionality Untested", $13 on ebay)
Video Card(s)	eVGA 9600GSO @ 741/1836/1053
Storage	Hitachi Deskstar 1TB SATA 3.0Gb/s
Display(s)	Big 'ol CRT
Case	$5 Banged up piece o' shit from TigerDirect liquidation center
Audio Device(s)	Creative Sound Blaster X-Fi XtremeMusic
Power Supply	hec ORION 585Watt PSU
Software	Vista Ultimate x64

Processor	Intel i7 4770K
Motherboard	Asrock
Cooling	Water
Memory	Team Xtreem LV 16GB (2x8GB)
Video Card(s)	EK Full WB HD7970
Display(s)	CROSSOVER 27Q LED-P 27"
Case	Danger Den Torture Rack
Audio Device(s)	Onboard
Power Supply	CORSAIR Professional Series Gold AX1200
Software	W 10 Pro

System Name	Box of Distraction
Processor	Ryzen 7 1800X
Motherboard	Crosshair VI Hero
Cooling	Custom watercooling
Memory	G.Skill TridentZ 2x8GB @ 3466MHz CL14 1T
Video Card(s)	EVGA 1080Ti FE. WC'd & TDP limit increased to 360W.
Storage	Samsung 960 Evo 500GB & WD Black 2TB storage drive.
Display(s)	Asus ROG Swift PG278QR 27" 1440P 165hz Gsync
Case	Phanteks Enthoo Pro M
Audio Device(s)	Phillips Fidelio X2 headphones / basic Bose speakers
Power Supply	EVGA Supernova 750W G3
Mouse	Logitech G602
Keyboard	Cherry MX Board 6.0 (mx red switches)
Software	Win 10 & Linux Mint
Benchmark Scores	https://hwbot.org/user/infrared

GeForce 8800 GS/GT/GTS Voltmods

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