HIS 3850 crashes freezes etc.

HI! im just new and my english can be bad, but i'll try to explain my problem

Asus p5k pro
c2d E8200
2x2gb PDP LLK
corsair hx 520W
win xp

month ago i boutght HIS HD 3850 IceQ 3 Turbo and since then i have problems, i have "gray screen" 1 time per day sometimes per 2 days, but its always the same and it mostly happen when i surfe on internet very seldom when i play a game, 3dmarks, memtest passed fine! no artifacts etc.

what i tried:
install clear system
tried different graphic drivers
turned off integred motherboard sound card
installed new LAN card
set PCI frequency on 102 and 98

one thing yet, that specificationf of my computer is new, i had the same problems with
a64 3000+ s939
asus a8n-e

i thought that maybe is something wrong witch compatibility, but when i changed processor, motherboard and ram problem didnt disappear

temperatures are ok maximum 70C for GPU

also i tried to set clocks lower than default but i had problems with that becouse atitool and atitrytool crashed system when i tried to set clocks, finaly rivatuner worked but ther was another problem, i had 70C for GPU in Idle with lower clocks



is there something i should try yet?


now i dont know what to do, i will try to give this card to service but i dont believe that will find the same problem becouse its seldom .

I own the same card and experienced the same problem. I had to set the fan speed up to 60% with RivaTuner, reboot, and then alter the clocks to get it to work right.

Also check and see if the power cables are plugged in securely.


My System:

AMD Phenom X4 9850 BE at 2.8GHz
MSI K9A2 Platinum
HIS Radeon HD 3850 Turbo 512MB (775MHz Core, 1050MHz Memory, never goes above 60 C with 60% Fan)
2GB Super Talent DDR2 800 (CL 4-4-3-8)
OCZ GameXtream 600 Watt PSU
Windows XP SP2