System specs: Asus A8N SLI Premium AMD Athlon 64 X2 3800+ 2.0 ghz Nvidia 7800 GT -(163.19 drivers currently, although fail occurs with everything) CORSAIR XMS 2GB (2 x 1GB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Windows Vista Home Premium 32bit I'm experiencing the same sort of TDR "nvldkmm.sys has stopped responding and recovered" that 1,000's of people are reporting on Nvidia's driver forums but I had no luck there so I wanted to see if maybe anyone had more insight here. The crash occurs most frequently when trying to display video or games, but can occur on displaying the desktop or browsing the web too. Most of the time if I quit the program immediately I can avoid a full crash, but I do get weird blue pixels and yellow horizontal lines corrupting the image on my screen. I just bought my first new monitor in years, an LCD that I'm really excited about and I'm determined to fix this problem once and for all so I can get some use out of my machine. Changing drivers versions, deleting the "nvldkmm.sys" file from the windows/system32/drivers folder, formatting and reinstalling Vista (at least five times) have all produced mixed results...sometimes I can solve the problem for a few days, sometimes a few minutes, but mostly not at all. There doesn't seem to be a consistent pattern to getting around the TDRs. Today, out of desperation, I unplugged one of my sticks of RAM to see if I have a bad memory module (although Memtest says they're fine). The first one I removed didn't change anything, but removing the second (and replacing the first) let my computer go from the "glitchy" mode to pristine color and performance immediately. So, I thought I might be onto something there.....I gamed for maybe 30 minutes in joy, then I quit and tried some video...and crashed with the same error message. This time it didn't produce the same graphics corruption as usual, just a blackout and a refusal to play video. So my final hypothesis is that maybe its my RAM overheating? I am sorry to type out a freakin manifesto, but I want you to know where I'm coming from. Is it my Ram overheating despite having the side panel open, and a 120mm fan in both the front and rear? If so, whats the easiest fix? According to BIOS my CPU is running nice a cool.... (i forget the exact number)Thanks much. (and congratulations if you made it this far) Edit: I'm using this add on fan in addition to this case Neither one appears to be pushing a whole lot of air now that i look...anyone tell me how to adjust that?