DX10 demos require lowering videocard overclock?

[cmdrdredd]

I wonder if anyone has noticed or experienced something similar to me. Under DX9 apps I can successfully overclock my HD2900XT to 810/975 without errors and it will run forever. When I ran the whiteout DX10 demo from AMD it showed artifacts and other issues related to my overclock. I had to lower my overclock to 780/950 to get rid of these problems. Now it could be heat related, but I don't know how I can speed up the fan. I have it on auto so it should ramp up when needed right?

Anyhow I was wondering if anyone else has noticed that DX10, while stressing the GPU more than DX9, requires the user to lower their overclock to remain stable without any artifacts.

 

[stnicralisk]

If you have artifacting while stressing the GPU you should not overclock so high. It is possible that this demo is stressing your GPU differently (more shader intense?) than the other benchmark you were using to test stability.

 

[cmdrdredd]

Originally posted by: stnicralisk
If you have artifacting while stressing the GPU you should not overclock so high. It is possible that this demo is stressing your GPU differently (more shader intense?) than the other benchmark you were using to test stability.

Well, 3dmark06 would loop forever at 810/975 not so with whatever is going on with the DX10 demo from AMD. Could be that the DX10 demo uses the tesselation engine and things like that.

Just curious if anyone else found DX10 to be unstable at high clocks where DX9 was fine.

 

[aka1nas]

3dmark 06 isn't Dx10. Arguably, anything that Dx9 or earlier isn't going to be using all of the functionality of the chip.

 

[cmdrdredd]

Originally posted by: aka1nas
3dmark 06 isn't Dx10. Arguably, anything that Dx9 or earlier isn't going to be using all of the functionality of the chip.

Oh I know that, but I'm looking to see if anyone had noticed the same thing I did. Just wondering if it was common, but searching around didn't tell me much. I did see a few people over at rage3d saying that Bioshock in DX10 made their overclock not so stable anymore.

 

[biostud]

seems likely, I think remember something about the need for downclocking CPU's a bit when going from 32-bit OS to 64-bit.