[4b33r]

The only GPU I currently have is a XFX GT640 4GB and it runs very cool as it only draws something like 60 watts. I would like to overvolt it by flashing an edited VBIOS.
I used keppler bios tweaker v1.25 (other versions don't work) to edit the bios. There are only 2 power states on the card. I can successfully change the lower power state voltage and everything works fine but I cannot change the higher power state voltage at all, if I do the card is not detected even after reinstalling drivers and I only get output on one display.
So currently I have the card running at 1.112v on idle at 324MHZ and running at 1.1v under load at 1045MHZ.
Is there any way I could successfully edit this VBIOS?

 

[ozlay]

Are you pulling to much from the PCIe slot?

 

[Avacado]

No idea why the slider won't work. You could try editing the bios in Maxwell BIOS tweaker to see if if works there.

 

[4b33r]

Are you pulling to much from the PCIe slot?

GT640's rated power draw is 65W and pcie can give 75W I am reading. Still doesn't explain why the card's bios would refuse to let me change the voltage on that particular power state in this first place.

No idea why the slider won't work. You could try editing the bios in Maxwell BIOS tweaker to see if if works there.

Maxwell Bios tweaker gives the same error as other versions of Keppler bios tweaker. Is there any other way I can edit the Vbios, maybe manually edit it somehow?

 

[Avacado]

Keplar and Maxwell tweakers ARE how you manually edit the vBIOS. I suppose you could try to find some .txt program that could read the .rom, but I doubt you or anyone would want to comb through that much code even if you found one. Doubtful you would even be able to accurately figure out which line correlated to what setting.

 

[Avacado]

Keplar and Maxwell tweakers ARE how you manually edit the vBIOS. I suppose you could try to find some .txt program that could read the .rom, but I doubt you or anyone would want to comb through that much code even if you found one. Doubtful you would even be able to accurately figure out which line correlated to what setting.

Upload your stock vBIOS .rom to this page in a .zip folder.

 

[4b33r]

Upload your stock vBIOS .rom to this page in a .zip folder.

Couldn't upload zip, uploaded it here easyupload.io

 

[Avacado]

Couldn't upload zip, uploaded it here easyupload.io

Got it, looking now.

 

[Avacado]

Getting the same errors as you. I will try to find a replacement bios on the tech powerup site. Did you save the STOCK vbios?

 

[Avacado]

Send me the old12.rom file.

 

[4b33r]

Getting the same errors as you. I will try to find a replacement bios on the tech powerup site. Did you save the STOCK vbios?

That is the stock VBIOS. Only thing that doesn't give errors is kepler bios tweaker v1.25

Send me the old12.rom file.

Here is the old12.rom where the lower power state voltage is changed easyupload.io
Here is one where the higher power state voltage is changed (doesn't work) easyupload.io

 

[Avacado]

I downloaded Ktweaker 1.25 It looks like I can change the voltage slider. What voltage do you want?

 

[Avacado]

P0 is your max boost state, P8 is everything else.

I increased the P0 to it's max of 1212.5mV. See if it works.

Upload files for free - GT640.rom - ufile.io

Download GT640.rom for free from ufile.io instantly, no signup required and no popup ads

ufile.io

 

[4b33r]

P0 is your max boost state, P8 is everything else.

I increased the P0 to it's max of 1212.5mV. See if it works.

Upload files for free - GT640.rom - ufile.io

Download GT640.rom for free from ufile.io instantly, no signup required and no popup ads

ufile.io

Same thing happened, outputs to only 1 display, display is cut from corners and card isn't properly detected

 

[Avacado]

Sorry to hear that man. I honestly don't know what to tell you at this point. You really need a newer GPU

 

[4b33r]

Sorry to hear that man. I honestly don't know what to tell you at this point. You really need a newer GPU

Well thank you for your time. I hope the prices fall soon, I know I NEED one.

 

[Avacado]

Well thank you for your time. I hope the prices fall soon, I know I NEED one.

I have an EVGA 750Ti SC I can give you on the cheap if you are interested. Just bought on ebay for 100 but I'll sell it to you for 60 shipped.

 

[4b33r]

I have an EVGA 750Ti SC I can give you on the cheap if you are interested. Just bought on ebay for 100 but I'll sell it to you for 60 shipped.

Thanks but i'll pass, gonna wait for something better