I have an His 7870 GHz Edition in my new build, and I was testing out some different settings in Afterburner (looking at how to increase FPS in games, how to drop temperatures without increasing the fan, etc.) and I feel that I have made a pretty bad error in undervolting my GPU too far.
I'm not exactly sure how far down the volts were before the display crashed (somewhere near the bottom setting in 2.3), but now my computer fails to recognize the GPU at all. The fan is spinning, so I know that my GPU is at least on, but I have now uninstalled Afterburner and swept all of the AMD drivers (by plugging in display through the motherboard- ASRock Z77 Extreme3), but I can't for the life of me get my computer to recognize the GPU or get any display signal from it.
I'd like to think that the card hasn't been damaged from undervolting, but I'm still pretty new to this.
i came to this forum through a search because i undervolted my trifire Ati 6950s to lower temps, as i could afford to lose 10-15 fps in my games.
It was 40 degrees C outside (hot day ) and my vid cards were reaching 80C which isnt bad but its just noisy with 6 vidcard fans all going hard as they each have 2 fans each.
with a mild undervolting and lowing the core clock by 100 and mem clock by 300, i reduced the temps from 80C to 60C and was pretty happy with the results as i only lost 5-10 frames. no instability in my games.
anyhow after i powered up my pc the next morning my mouse cursor would freeze in win7 and then the display would freeze and reboot every 5 seconds or so. i quickly went into afterburner and reset the voltage and clocks to default and restarted my comp.
after it rebooted i was still seeing the same problem so i booted into a winXP install and sadly same freezing and display going blank and resetting.
after pulling apart my $800 trifire setup and trying 2 cards, same deal, swapped out the order of the cards and same deal
pulled em all out and put 1 back in and problem gone, computer works fine. now i will have to see if its 1 faulty vid card that didnt like underclocking or undervolting.
Sounds like something to do with cmos. When I took my card out of pc with the power out for 3 days and put it back in it had a hissy fit and wouldnt boot windows properly then the res was stuck at 800*600.