Hi, I have got visiontek HD4850 about month ago. well it was running fine with ati's hotfix drivers ( which was 8.6 i think ). got 115xx 3dmark06 score at stock ( 625/993 ) settings. now when newer 8.7 drivers came out, i upgraded to it, but it messed up everything, when i benchmark at 730/1150 settings it scored only 10503 3dmark06 score!! which is even lower than previous score at stock settings! I tried uninstalling drivers/ restored PC to previous state, used driver cleaners..etc etc..later I formatted my PC and installed vista x64 sp1, installed hotfix driver . but now even with this driver it scores 10k mark! also same result with 8.7 drivers again. it is giving only 24 FPS in GRID at 1280x1024 full details, previously it was giving 35-40 fps at this settings. i donno wth happened with card....should I try drivers came in box? Test results @ 3 GHz CPU, 1723 FSB, 840 MHz RAM 4-4-4-12, stock GPU clocks Test Results @ stock ( 1.86 GHz CPU,1066 FSB, 800 MHz RAM 5-5-5-18 as SPD, Stock GPU clocks ) Test Results on My friend's PC: Config: P5k-VM mobo C2D E4400@ 2.67 GHz, 960 FSB 4 GB Ballistix ( 800 MHz 4-4-4-12 , my RAM ) HD 4850 @ stock. seems like I m always getting lower SM2 and SM3 score compare to other users You might want to know few things about my system for troubleshooting: 1. I have dont pencil mod on my 4850. last stable test was at 735/1100 clocks. 2. I also have tried to remove pencilmod to check whether it was creating problem or not? but no luck with it. 3. I have applied AS5 thermal paste on GPU and CPU. 4. my system have PCIe x16 v1 slot. 5. I have 4 GB RAM, 2 of them can run @ 1075 MHz...but all 4 GB cant run at this setting...so i m running at 840 MHz.. previously it was creating stuttering problem few months ago...but then i changed RAM slots and it worked fine..this is not any issue. 6. I havent changed any software related settings, nor with ATI CCC except fan profile. 7. I have updated BIOS To latest one, also I have MSI BIOS on my 4850 ( I have visiontek card as mentioned ). 8. Temp. reading are fine , it isnt any issue. 9. I have tested my card on Vista x64 sp1 and xp x64 sp2 with latest updates and latest drivers..even with 8.8 beta. My system specs are as below : C2D E6300@ 3.01 GHz. 4 GB ballistix @ 840 vista x64 sp1 ASUS P5B Deluxe mobo.