8800GT voltage mods

[aznsniper911]

In the picture I see a Vmem mod but no Vcore mod, so I'm assuming there isn't out one yet for the pencil?

[winbond]

i sold my card, the core overclocks well but i think the design of the card is too weak to sustain high voltage and overclocks for long periods of time,

i read that there are new galaxy and palit 8800gt with 3 phase power, i will be hunting for one of those and hope it comes with better ram, should be interesting

[Unseen]

Only vgpu mod @ 1,22v and on water.

[Achill3uS]

Thx for the mods guys, I'm ready to testing

[Hazaro]

Thx for the mods guys, I'm ready to testing

Any chance we an get bigger and closer pics?

I wanna see your connection

*Sweet Achill3uS!
This is gonna be one hectic weekend

[Mysterfix]

Doe's anybody know what max safe 24/7 voltage is on these cards?

I got mine in yesterday and the volt mod went smoothly but I have no idea what's safe for 24/7 use. I've had the card clocked as high as 900/2000/2000 bench stable but it took 1.4v to do it. I'm currently running it at 875/2000/2000 @ 1.28v, still in the process of testing the shaders and memory though.

[Achill3uS]

Any chance we an get bigger and closer pics?

I wanna see your connection

*Sweet Achill3uS!
This is gonna be one hectic weekend

Thx mate i edited the pic, will upload better for you! btw tomorrow I will test the card outside with my 6850 under DI, and next week my gpu pot will finished and after the FUN begins

[Hazaro]

Thx mate i edited the pic, will upload better for you! btw tomorrow I will test the card outside with my 6850 under DI, and next week my gpu pot will finished and after the FUN begins

Link/picture not showing to me. Did you just remove it? (Or pm me)

*A DI run... shame you don't have a quad to pump your benches!

[JKDC]

Would anyone post the resistances to get the 1.22v and 1.4v please?

[GAR]

Anyone try the pencil mods????? for the vcore??? i dont wanna be the test dummy LOL

[GAR]

ok, so i tried that pencil mod, and it didnt work, nothing happened.....did both resistors and temps and overclock stayed the same...........

[Mysterfix]

Thanks guys, for not slapping me silly for missing those 3 glaring post about the max voltage applyable to these cards.

Just in case anybody else missed it 1.4v on the core should be safe but caution is advised.

[Hazaro]

I can confirm that this is working. I tried 1.25 and 1.3 but got the same results. I now set it to 1.2 volts and have the same OC. I imagine this only goes to 1.15 on the card. My OC went from 702/1722 to 756/1836. I set the lowest voltages to 1.1 and the two highest to 1.2. You have to edit the voltages before they show in the table. My temps went up 2C idle and 3C load with a thermalright V2 cooler. With stock cooling you better have the fan speed up to 50%+ before trying this.

It's still not enough to stop the vmod unfortunately but it is free and easier. Make sure you have the latest NBitor (v3.5a) and NVflash (v5.57). Previous versions don't support the 8800GT. Use the thread on extreme bios mod for the 8800GT for switches and floppy DOS image. Remember to back up original BIOS first and have a spare PCI card just in case you need to flash it back.

What is stopping you from putting 1.4V in the BIOS? The chip?

[Renegade5399]

http://www.vr-zone.com/articles/Gala...ower/5387.html

Any news on how this will volt mod?

[largon]

Renegade5399,
Need pics of the backside of the card.

[GAR]

I tried the bios vmod and nothing doin, this crap card i have is a dud.........at this moment i will try any kind of a mod, my next mod is a real solder vmod.

[sluggo]

Anyone know if all brands use Qimonda mems on all 8800 gt cards? , and i wonder one more things also can a new bios or something remove the big overclocking steps?. The clocks steps are realy to big.

GoldenTiger what psu do you using? and are you trying to clock in sli?

The programmable clock generators used on these boards are capable of thousands of frequency setpoints. The steps that the overclocking tool allows are only those steps allowed to it by the board's BIOS. Modifying the BIOS to permit finer control of the clock generator is not something I know how to do, but the limitation is definitely not the hardware.

[Mysterfix]

Core clock stepping seems to be proportional to the shader clock, meaning if you set your shader clock around 1800 you should get smaller jumps in core clocks. It works tha way on my card (eVGA SC 8800GT), I get some pretty big jumps when the shader is at default value but upping it to beyond 1800mhz makes the core clocks move in smaller increaments.

[F@32]

Has anyone tried to increase vgpu through bios mod. I increased the stock bios' 3D voltage with Nibitor to 1,22v and flashed it back to my card. It appears to be working as I get far more stable core clocks over 700MHz and up to 800MHz. I guess the voltage increase is small (I didn't have the time to measure it with a DMM) but is probably not even close to the set value. When I'll get home I'll measure it so not to speak hypothetically.

Are you 15min AtiTool artifact free at 800MHz? Have you tried DMM measurement to be sure it changes anything? I set my to 1.2v and same clocks as 1.1v. I squeezed extra 25MHz going from 1.05 to 1.1 though...

Regards

[Renegade5399]

Renegade5399,
Need pics of the backside of the card.

As soon as I get my grubby hands on some, they will be posted!

[pinto]

VGPU:1.3v wtercooled:

3DMark Score 17231 3DMarks
SM 2.0 Score 7218 Marks
SM 3.0 Score 6777 Marks
CPU Score 6352 Marks

[4Qman]

VGPU:1.3v wtercooled:

3DMark Score 17231 3DMarks
SM 2.0 Score 7218 Marks
SM 3.0 Score 6777 Marks
CPU Score 6352 Marks

Mate does it scale any more with more GPU voltage?,. Also is the memory voltage stock?

What brand card also

Nice results and thanks for sharing.

[pinto]

OVP protection, i think, above 1.3v (or my card doesn't like more volt)
stock volt on memory but not max out (at least 1070mhz possible but not tested with 860mhz gpu)
My card is a BFG OC
temp wasn't really good 49°c full load (the Q6600 at 1.64v gets really hot)

[Hazaro]

VGPU:1.3v wtercooled:

3DMark Score 17231 3DMarks
SM 2.0 Score 7218 Marks
SM 3.0 Score 6777 Marks
CPU Score 6352 Marks

Nice...

[Mysterfix]

OVP protection, i think, above 1.3v (or my card doesn't like more volt)
stock volt on memory but not max out (at least 1070mhz possible but not tested with 860mhz gpu)
My card is a BFG OC
temp wasn't really good 49°c full load (the Q6600 at 1.64v gets really hot)

Yep, you are correct about OVP, 1.3v is the max you can get without it kicking in. Anything above 1.3v and my card will stop responding after a few minutes and mm reading is 0.01v until computer is powered down and restarted.