I have HIS ICEQ X1900 XT and have also noticied missing and sometimes stretched polygons at the end of canyon and the end of deep freeze (3dmark06). I'm running CAT6.8s
Really annoyed as I have spent the last few painful days trying to get my E6300/P5b Deluxe stable with an overclock, hours and hours of priming/memtest/superpi etc.
Then when I think it's all nice and stable I see problems with 3dmark06
I am sure I have not had these problems before with this test.
I have monitored GPU temps during the canyon/deep freeze tests and it doesn't go over 73oC (which is well within specification), the fan on the HIS goes to 32% when it hits 70oC. The GPU/MEM clocks switch from the standard 2D speed to the standard XT 625/725 speeds as well (so the bios isnt doing any PEG link overclocknig etc.)
So tonight I will try the following.
1.) raise fan speed on X1900 to 100%, run 3dmark and see if it's an overheating issue, test.
2.) lower fsb and all other OC related settings back to stock and test
3.) check all catalyst driver options (mipmap quality settings as mentioned above etc.). then test.
4.) drivercleaner to remove all ATI drivers, try CAT 6.7's. then test.
5.) remove directx 9 and re-install, test.
6.) hope i dont get this far, remove and clean reinstall XP.
7.) if i get to this step it's RMA time.
FOR NOTE: I have PEG stuff set to slow(disabled) in BIOS, as this feature from ASUS may hard overclock the GPU/MEM. I have PCI-EX locked at 100 and PCI at 33.33MHz
My PSU is an Enermax Liberty 660W, so dont suspect this ?
Does PCI-Express connect to the southbridge or the northbridge ? (i'm sure it's the northy, but if not, i might try raising southbridge voltage ?)
Perhaps I need to change the PCI-EX speed from 100 to 101 or higher ??
arghhh so many questions and so much testing to do, but im stuck in work and cant do diddly until i get home
