Read here, first and then 3rd page.
http://forums.techpowerup.com/showthread.php?t=17327
This guy had it happen to him.
Let's see, I see that he got his card severly underclocked and the screen messed up, later on it died. It didn't die due to low voltages but to very low core clock. I've already got a low core clock and are fully aware that there is a bottom limit as well as a upper limit.
Usually the card don't even underclock when you press find maximum core, so it's possible that something was wrong with the card even before this happened.
I can also see that somebody "has heard" that the card can die due to low voltages.
Well if it happens to me, I will be the first to let you know that I killed my cards due to low voltages. Then you will have a more reliable source.
The topic in that thread were low clocks=dead board, not low voltages=dead board. In this thread we're speaking of voltages.
It seems like a lot of people have missed it but internet forums aren't good source for all information very much are just random guesses and rumours. People will more than gladly spread rumours without having a clue if it's for real or not.
Underclocking is as much of an art as overclocking. You can't just put the sliders in the bottom and press apply, you have to fine tune your card, check for abnormalities everywhere, use overlay, use multiple monitors, do stressful 2D of all sorts.
When you go 3D, go there in steps, don't just go from bottom clock to maximum clock.
Currently my X1800XT is idling at under 40c, no fancy cooling, just a Accelero X2 at 45%
After searching lots of other forums the lowerst i've seen anyone undervolt the mem is like u 1.785v, so until an app comes out that gives u a greater range to use i'm afraid thats it.
As for how low the mem will actually go, i found this on samsungs website(see attached) - spec sheet for GDDR3.
I'm guessing but is the default voltage around 2.0v? My interpritation of the chart is its safe to go +/-0.5v, so min. 1.5v and max. 2.5v
Thank you very much, informative and probably you're right about the 1.5v. If 1.5v is within specs you could probably go even lower at low memory clocks. Reducing to 1.5v from 1.785 would probably reduce the heat by 20% from on the memory.
