Post
Topic
Board CPU/GPU Bitcoin mining hardware
Re: Undervolting a 5870 and a 5770 to achieve better MH/J performance
by
_Vince_
on 17/02/2012, 05:26:28 UTC
I did a pencil mod and thanks God, it did not go south!

After checking the datasheet, I decided to play with the voltage divider. The chip is programmable; but thanks to the laziness of Gigabyte engineers, they did not implement that feature.

Instead, a hard-wired voltage divider is used and that voltage divider will serve as reference voltage

http://desmond.imageshack.us/Himg28/scaled.php?server=28&filename=84097862.png&res=medium

I used a pencil and get the 5k Ohm resister went to 4.5k.

Voltage measured at the chokes changed from 1150 mV to 950 mV. Beyond my expectation Smiley