8800GT voltage mods

[largon]

I personally wouldn't recommend removing the "OCP resistors" (78X) completely - replacing those burned fets are a PITA. Luckily there's another way. The method described in G80 OCP -thread works on G92 based cards too. Basically it means you solder three resistors to the OCP circuit parallel to certain SMCs (surface mount capacitors).

It goes like this:

Note that only the two upper resistors are needed for G92GT as the reference PCB has two active vGPU phases.
Resistor value of 1.2kΩ is not set in stone, lower values cripple the OCP even further, but it is possible adding Rs of considerably lower value would interfere with the controller chip's ability to maintain balance between the phases. Higher value Rs are safe but the gained headroom becomes smaller the higher you go.

[Niccolò]

I personally wouldn't recommend removing the "OCP resistors" (78X) completely - replacing those burned fets are a PITA. Luckily there's another way. The method described in G80 OCP -thread works on G92 based cards too. Basically it means you solder three resistors to the OCP circuit parallel to certain SMCs (surface mount capacitors).

It goes like this:

Note that only the two upper resistors are needed for G92GT as the reference PCB has two active vGPU phases.
Resistor value of 1.2kΩ is not set in stone, lower values cripple the OCP even further, but it is possible adding Rs of considerably lower value would interfere with the controller chip's ability to maintain balance between the phases. Higher value Rs are safe but the gained headroom becomes smaller the higher you go.

Can i shade them with a pencil? I think my ocp kicks in at 1.4v over 840gpu and 2000 shaders, and i'm stuck with it. I'm lazy soldering, i'd rather go for a pencil
Is that possible?

[Thickbrit]

Does anyone have or can anyone help with the ocp mod for this xfx 8800gs (same as gt) please ? The ic is labelled BN-9H.Thank you.

[Renegade5399]

Can i shade them with a pencil? I think my ocp kicks in at 1.4v over 840gpu and 2000 shaders, and i'm stuck with it. I'm lazy soldering, i'd rather go for a pencil
Is that possible?

Simply: No, it just doesn't work right. I just soldered a couple cheapy Radio shack resistor in parallel and it worked great.

Does anyone have or can anyone help with the ocp mod for this xfx 8800gs (same as gt) please ? The ic is labelled BN-9H.Thank you.

Do you have a high res pic of the whole back of the card?

[Thickbrit]

Hey thanks.This is about as good as my camera gets.If you need macros of specific areas i can do that or i can borrow a camera for better pics of the whole pcb.

[HitandRun]

OK you gurus! Anybody knows how to do the OCP on the Galaxy 8800GT? Mine card is already voltmodded (look at post # 832) and I came to a limit on LN2. It looks like 1.5V under load it the end of this card. Need the OCP mod now.

[Niccolò]

Simply: No, it just doesn't work right. I just soldered a couple cheapy Radio shack resistor in parallel and it worked great.

I dont' understand, why it shouldn't work?
The goal is to reduce resistance as long as you do it, it doesn't matter the way, does it?

[Renegade5399]

Because you have to be sure the value you lower it is the same on each power phase. Pencil modding it won't get you a reliable and stable result.