I know you are all probably sick of these, but I'm having issues and I need to know whether it's my video card or my power supply. It is a custom-built job and uses an Enermax mid-tower ATX case. First off, System Specs: Pentium 4 3.0Ghz (800MHz fsb) MSI 865PE Neo2 LS (AMI BIOS version 1.7) (onboard 10/100 LAN) 2 512MB PC3200 RAM sticks (Geil) Dual-Channel operation Western Digital 40GB 7200 RPM (8mb cache) Maxtor 9GB 5200 RPM Creative SoundBlaster Live! Value Lite On 52x DVD-ROM 2 80mm case fans, 1 PCI slot exhaust fan (all three use four-pin connectors) Gainward GeForce FX 5900 Ultra "Golden Sample" (256MB) Dell M780 17" CRT monitor Dell QuietKey standard keyboard Logitech USB Wheel Mouse And, the suspected troublemaker: PowerUp 350W power supply (LC-B350ATX) Ratings from sticker: 28A 3.3v, 35A 5.0v, 16A 12v 0.3A -5v, 0.8v -12v, 2A +5vsb 200W combined 5/3.3v max, 192W 12v max, 330W 3.3/5/12v max, total output 350W My problem is this: Before, I was running a Gainward GeForce3 ti200 Golden Sample card and the system ran great. No artifacts, no freezes, no overheating, nothing. But, when I upgraded from the GeForce3 to the GeForce FX 5900 Ultra, the 5900 didn't perform any better than the GeForce3. After a day or two, I began to see freezeups happening in my 3D games (such as Savage, EverQuest, and Neverwinter Nights). Now, it has gotten to the point that I cannot play any 3D games without texture render problems, artifacts, and major render glitches. When I put the GeForce3 back into the system, it works fine. Overheating isn't a problem, the case is very well ventillated. I've tried re-installing drivers, DirectX, etc. Nothing works. I don't have a system that I can test the video card in but I highly suspect that it's the power supply not being able to keep up with the system's needs. Does this sound like a reasonable thing to you guys?