ATI 3850/3870 Voltmod thread

[Clint]

If I shade that part, is there any way to know what the change in voltage is without a voltmeter?

Are there any applications that can tell me?

Thanks

I would buy one multimeter ifI were you, a cheap insurance

But to answer your question;
I have had a really hard time to shade it down to 1.0 kOhm with a 4B pencil that is very soft, and that has given me 1.415 volts 3D.
I now bench @ 958/1250 no problems, this core scales like a dream

So if you go nuts on the shading I doubt you will get more than 1.45 volts out of it anyway, and that is pretty safe even on the stock coooler.

[HousERaT]

I would buy one multimeter ifI were you, a cheap insurance

But to answer your question;
I have had a really hard time to shade it down to 1.0 kOhm with a 4B pencil that is very soft, and that has given me 1.415 volts 3D.
I now bench @ 958/1250 no problems, this core scales like a dream

So if you go nuts on the shading I doubt you will get more than 1.45 volts out of it anyway, and that is pretty safe even on the stock coooler.

Intersting, sounds like you'll have to shade multiple resistors in order to go higher on the vcore, like how you would pencil mod a 8600GTS.

How are the temps on the 3870 after the pencil mod?

[Clint]

Intersting, sounds like you'll have to shade multiple resistors in order to go higher on the vcore, like how you would pencil mod a 8600GTS.

How are the temps on the 3870 after the pencil mod?

After adding 0.83 volts I get a temp raise around 6-7C to 58C on the stock cooler running @ 100%.