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Howto: XFX 8600GT Voltmod by P_Doughboy

post #1 of 39
Thread Starter 
Ok, so I couldnt find any guides on howto voltmod an xfx 8600gt...and i couldnt get scrappy and use other voltmod guides because xfx really made their card physically and functionally different from the other brands of 8600gt's...

So before I began voltmodding, i wanted to see how much it could overclock on stock voltages; here were my results: on the default of 1.43v core and 1.91v memory and on defaults of 620/800, I was able to overclock to 720/970 which really is a good baseline overclock considering true default is 540/700

First Things first...get good cooling; on crappy stock cooling my idle was 57 and load 87 but with the zalman vf900 and overclocked idle is 42 and load is 51...quite a difference



so i started pricking and prodding the card with my sweet radio shack digital multimeter, and found the measurement points for vgpu and vmem. I also looked up the specs for the buck pwm voltage controllers on this particular card so that I could find my variable resistor points...I would reccomend getting 2 x 50k variable resistors, and setting them to 20k max and tune from there...they may be big, but they do the trick you will come to find that this was a "dirty" mod anyways

my 50k variable resistors:


basic overview for future instructions:


instructions for gpu voltmod:


instructions for mem voltmod:



Conclusion:
In the end, I did not use the vgpu mod because I couldnt get enough power to the video card...so you may have to choose severely overclock either your gpu or your ram unless your situation is different from mine...(the next logical mod would be to attach a pci-ex power connector to an 8600gt )




i eventually got the ram up to 2.02 ghz on a voltage of 2.24v. and the core up to 700mhz on default voltage of 1.43v. (memory seems to affect performance more than core speeds)




so really, i didnt get the best results but its a start and an accomplishment not to have broken it the first day i got it if somebody has this card and does this voltmod...let me know how it goes
post #2 of 39
why don't u raise the core i got 6300 at 845/950 at 800/1000 ur score would be sweet
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post #3 of 39
Thread Starter 
Quote:
Originally Posted by mugan23 View Post
why don't u raise the core i got 6300 at 845/950 at 800/1000 ur score would be sweet
my pci-ex slot doesnt seem to be delivering enough power to the card, because if I had them both overclocked about that much, it would artifact and shutdown ...but I could have the memory at 1050mhz and the core at 700 and nothing bad would happen or vice versa with the core at about 850 and memory at 800 and nothing bad would happen...so i have concluded that im not getting enough voltage to the entire card itself...im going to put a six pin pci-ex power cable on it
post #4 of 39
Dude use the search! In my sig there is a link for a pencil mod
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post #5 of 39
Thread Starter 
Quote:
Originally Posted by PaRaDoX View Post
Dude use the search! In my sig there is a link for a pencil mod
i already looked at it, but i am always someone to try something new and personally i dont like pencil mods...
post #6 of 39
hells ya . lol any way good luck with ur oc looks very nice. if my evga could hit a stable 1050 mem hdcp or not i would have kept it.
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post #7 of 39
You can uses resisters also, pencils are better because you don't have to solder the hardware until you find the 'sweet spot'

And it does not void the warranty.. since you can get rid of it

people get good results with mine.

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post #8 of 39
Thread Starter 
Quote:
Originally Posted by PaRaDoX View Post
You can uses resisters also, pencils are better because you don't have to solder the hardware until you find the 'sweet spot'

And it does not void the warranty.. since you can get rid of it

people get good results with mine.

solder = good
post #9 of 39
Being able to return broken hardware = good

I'd take the warranty over a permanent mod.. since I can use conductive pens to hold resisters on, too.

Like the nobs though... might have to do something like that with mine when it comes back from XFX so i can get a few more bucks from it.. I have a few bay things that I can't use anymore :3
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post #10 of 39
Thread Starter 
Quote:
Originally Posted by PaRaDoX View Post
Being able to return broken hardware = good

I'd take the warranty over a permanent mod.. since I can use conductive pens to hold resisters on, too.

Like the nobs though... might have to do something like that with mine when it comes back from XFX so i can get a few more bucks from it.. I have a few bay things that I can't use anymore :3
i understand your point, but ive gotten back an x1650 from newegg after soldering it it leaves a little to no trace behind if you know how to clean up...ethics = bad
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