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Topic: 7970 undervolting - page 3. (Read 17520 times)

sr. member
Activity: 369
Merit: 250
April 05, 2012, 11:46:23 AM
#4
85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.

Working on it. And it's in the computer I'm running now.  When I upgrade I'll buy a higher quality one.

wow, what programs do you use to set the clock speed/memory/voltage?

For a long time i was running mine at 978mhz 1.043v with MSI afterburner beta

Msi afterburner.  I downclock memory in cgminer, because afterburner doesn't like to lower it past 850.

Also what card are you using? I seem to have better luck with the Black Edition cards as they appear to be higher binned.

xfx 7970 black edition.  76.7% ASIC quality
full member
Activity: 169
Merit: 100
Green Mining 85% Cheaper
April 05, 2012, 10:22:04 AM
#3
Also what card are you using? I seem to have better luck with the Black Edition cards as they appear to be higher binned.
donator
Activity: 1218
Merit: 1079
Gerald Davis
April 05, 2012, 10:20:03 AM
#2
85% efficiency?  Get a better PSU.

Also would be nice if you have/get a Kill-A-Watt so you can compare calculated load @ wall w/ actual load at wall.
sr. member
Activity: 369
Merit: 250
April 05, 2012, 12:34:10 AM
#1




Still venturing lower Cheesy

Clock: 1000mhz
Memory: 710mhz
Voltage: 0.968

Mhash/s: 580

Power based on GPU-Z

(12.09v * 10.5A) = 127W

Take into account 85% efficienct: 127*1.15 = 146W

580/146W = 3.97 Mhash/W

Smiley

Update:

Dropped voltage down to .955v 100% stable.



(12.09v * 10.2A) = 123.3W

85% efficiency: 123.3*1.15 = 141.8W

580/141.8 = 4.09Mhash/W
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