7800GT Vmod

[Afterburner]

I will be picking one up very soon... Has anyone figured out a Vmod for the core... I'm surprised that nobody has asked until now...


EDIT @
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Vddr Mod - Connect a 20k variable @ highest resistance between pin 4 and pin 7 of IC No.1 and work your way down.



Alternatively you can go here for both Vgpu and Vddr mods

[persivore]

Post some pictures of the back of the card when you recieve it

[Afterburner]

Oh gosh.....I dont have a webcam Maybe if I borrowed my buddie's pics from a review he did. Its a Sparkle 7800GT clocked @ reference speeds. He got a max of 525mhz on the core with a DD SLI block with no mods done yet.....

[persivore]

When you get the card, can you tell me what is written on the chips I've circled.

[Afterburner]

Roger dat sir......

[Afterburner]

I havent bought the card yet but I happen to be workin at a booth that has retail 7800GTs. Opened one up and got the ICs written down......



The 2 x ICs you circled are identical. They are the Intersil 6549CBZ and it can be found here

[Afterburner]

I now have the 7800GT in posession.......eagerly awaitin an update

[persivore]

I think that ViperJohn might be working on mods for the card, but I'll help anyway.

Can you check the voltage at the pin I've marked on both of the chips please.

[Afterburner]

Sorry for the delayed response.....No.1 reads 2.078v and No.2 reads 5.04v

[persivore]

It looks like one section of chip number 1 is controling Vdd, but I don't know what is being used for Vgpu (yet ). Can you check the resistance between the pin i've marked (pin 4) and ground on chip number 1 please.

[Afterburner]

Pin 4 of IC No.1 reads......12.42 Mega ohms

[persivore]

12.42 Mega ohms
That sounds (alot) too high to me. Were you checking the resistance with the power off?

[Afterburner]

Nope......the system was idle in windows Maybe you could tell me how you want it done exactly

[persivore]

Nope......the system was idle in windows Maybe you could tell me how you want it done exactly

Can you check the resistance with no power on (and the card out of the system if possible, but it shouldn't matter if its left in)

[zippyc]

I am also interested in this mod, lemme know if I can help, as I have one of these cards already (PNY), as well as a multimeter. And THANKS!

zippyc

[Afterburner]

Pin 4 on IC No.1 reads 620 ohms.....

[persivore]

For the Vdd mod, connect a 20k variable resistor between pin 4 and ground.
I'll look into Vgpu a bit more

[Afterburner]

HeHeH.....thats settled then Btw which pin on the IC is ground.....

[persivore]

You can use pin 7 as ground

[Afterburner]

You can use pin 7 as ground

noted.......

[Afterburner]

Clarification - I suppose the 20k will be set to the highest value before use

[persivore]

Clarification - I suppose the 20k will be set to the highest value before use

yea, set it at 20k (or as close as it will go to 20k )

[Afterburner]

Noted.......

[Afterburner]

Somethin tells me this sucker is responsible for the Vgpu........ Notice the abundance of measuring points to test out. Wad do you think.....

[Afterburner]

Ok I have readings of .....1.198v and 1.203v @ 2 resistors respectively and 1.278v @ a measuring point