Hi All, I am having problem with my graphics card and have been scouring the net for a couple of days trying to sort it out. Basically when gaming (Mainly COD4 as an example), after a while playing (sometimes only a few minutes), the game will start artifacting (some parts of the screen flashing, random lines and areas flashing quickly), and eventually it will crash and go to a black screen with the sound still playing or on loop. The only way to get out is to hit the reset button. Not good! Sometimes on reboot Windows will say that the crash was caused by the graphics driver, and is searching for a resolution. Obviously it never finds one! My PC specs are: Intel Core 2 Duo 6300 - Stock Cooler Gigabyte GA-965P-DS3, Rev 1.0, F12 BIOS 2 x 1 GB Geil DDR2-SDRAM PC2-5300 (333 MHz) Sapphire X1900 XT - With Accelero 2 Nothing Overclocked IBM/HGST SATA 160Gig & Diamond Max 10 SATA 160Gig Jeantech 450 Watt ATX PSU with 120mm fan 3 x 120mm fans in Antec P180 Case Vista Ultimate (Updated) All up to date motherboard drivers Catalyst 7.12 Drivers (Previous drivers removed / cleaned with DriverCleaner.Net) After a lot of searching, and playing with Riva Tuner, ATiTool, Speedfan, Coretemp, and CPU-Z I think I have narrowed the problem to the Voltage Regulator overheating, and/or possible a dodgy PSU. Basically if I leave my system to its own devices when gaming, the following happens (data gathered from RivaTuner): GPU temps gradually goes up to about 85 Deg C The fan duty cycle only goes up to about 36% (about 1300 rpm) Ambient temp rises to about 65-70 deg C Voltage regulator output goes to 1.45v Voltage regulator current hovers around 33A Voltage regulator temp steadily climbs up to 90-odd deg C I don’t think most of these figures are too bad, except the voltage regulator temp. So I tried setting the fan to 100% with ATiTool, and the situation is much better: GPU temps gradually goes up to the mid 60’s C The fan remains at 100% (just over 2000 rpm) Ambient temp steadies at about 45 deg C Voltage regulator output goes to 1.45v Voltage regulator current hovers around 33A Voltage regulator temp hovers around 70 deg C One other thing I have noticed is that the -12V line from the PSU seems to be at approx -17V & the -5V line –seems to fluctuate between -8V & -5V. This doesn’t seem right, but I couldn’t find anything about this anywhere! (If someone tells me how, I can post some pics of the artifacts in COD4, and the .hml RivaTuner log files if they are any use in helping diagnose the fault! Also, is there a plug in to monitor my motherboard voltage settings with RivaTuner? I think it would be very helpful to have all the data collected by the same app!!!) So, can anyone make anything from this? If it is the voltage regulator over temping, what can I do about it – is there a decent heatsink I can buy to help reduce the temps. Or could this be fixed with a better PSU – I’m thinking of perhaps the Corsair HX Series 520W Modular PSU - ATX12V v2.2 APFC. It should be plenty powerful enough! Any comments & help greatly appreciated! TIA, Cocksy.