9800XT Vgpu mod

[bmg]

Originally posted by charlie
Maybe he meant 3.9V, lol

C

The memory spec is 2.80+/-.15V, but the default voltage is around 2.68V. I've found cases with my two 9800XT's where increasing much above 2.8V actually increased artifacts. This was gaming not necessarily benching. While running Unreal2 my first 9800XT had fewer artifacts (sparkle) as mem voltage was increased. I ended up running it at 3.0V. However, when I was playing Halo I had sparkle artifacts in some places, and reducing voltage below 3.0V reduced the artifacts. I ended up running at 2.85V as a compromise. My second 9800XT has much better performing memory than my first card, but I don't see a lot of memory improvement as memory Vdd voltage is increased. I'm wondering if Vddq or Vtt is limiting my second card. The core definitely isn't the problem.