I've got a 2006 Intel Dual Core Mac Pro 1,1. A few years back the ATI Radeon card (1900?) overheated and fried it before the warnings on it came out. About that time I had just gotten a tablet computer and so I used that as a replacement while I figured out what to do with the mac pro. I eventually got the memory recovered, a new HD and graphics card. I've been using it now without problems for 6 months to a year. All of a sudden the NVIDIA GeForce 9800 GT is loudly ramping up the fan speed on startup. The first time, I panicked, shutdown the computer and looked for extra dust or anything in the fan. Started it back up and no extra speed or noises, I think everything's fixed. But now anytime its been off for a bit it dangerously ramps up the fan speed at startup and then after a shutdown and restart, it's fine. I've seen a bunch of posts/issues with the 9800 in this forum and elsewhere, but no one seems to have my exact problem and the fan sounds worse almost everytime. I'm worried because one post said the 9800 GT wouldn't work with my computer, even though it has for awhile and the system profiler actually says it's a 8800 GT, not a 9800. Is there a driver patch or some way to cap the speed on startup everytime? I'm really worried and I've spent too much on this comp from a bad graphic card already. Mac Pro 1,1 OSX 10.6.8 2 x 2.66 Dual-Core Intel Xeon EVGA NVIDIA GeForce 9800 GT --what the system profiler says it is: NVIDIA GeForce 8800 GT 512 MB 0x0602 I have no idea how long it's thought it has the 8800 card.