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Ati 3850 mod

post #1 of 14
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Hi I got a ati sapphire 3850 512mem and I want to mod it pencil mod and vmod so I can get up to 800core like other ppl but i dont know how, right now im at 756core 985mem
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post #2 of 14
http://forums.techpowerup.com/showthread.php?t=48544

here u go. It's the pencil mod for the 3870, but it's the same with the 3850. Ive tried it for my bro's 3850, and it works fine. It's the resistor coded as R1222
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post #3 of 14
How does pencil modding work? I don't understand how writing on a resistor changes anything... Sorry for hijacking the thread!
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post #4 of 14
Quote:
Originally Posted by holtzman View Post
How does pencil modding work? I don't understand how writing on a resistor changes anything... Sorry for hijacking the thread!
increases voltage to give higher clock speeds for the GPU
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post #5 of 14
well u shade a resistor with a Pencil, it decreases the resistance, and the voltages in the 3870/3850 are controlled by a resistor. Decreasing the resistance = increasing the voltages.
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post #6 of 14
I understand that part of it just fine, but how does rubbing graphite on the outside of a resistor effect the resistance? thats what I don't understand...
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post #7 of 14
you use a conductive pencil which allows the electricity to flow through it instead of the resistor.
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post #8 of 14
Quote:
Originally Posted by holtzman View Post
I understand that part of it just fine, but how does rubbing graphite on the outside of a resistor effect the resistance? thats what I don't understand...
Let's ask Bill Nye.
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post #9 of 14
if you can get to 1.34- 1.35 which is 3870 stock vgpu you should be able to run at least 860 on the core
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post #10 of 14
I thought you can mod the BIOS to raise voltage?
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