I have a 5,1 Unibody 15" MBP (late 2008) that has recently started exhibiting strange behavior under Windows 7 when playing 3D games. After a few minutes of working normally it will suddenly run very slowly at approximately 1 fps and after a while will work fine again for a few moments and then repeat. I have managed to determine that the slowdown is happening once the GPU reaches 110 degrees Celsius. That in itself us quite scary to me and feels way too hot. Once the GPU cools down to 100 degrees the speed goes back to normal. This happens only in Windows. I have done quite a bit of experimenting between Windows and OS X using the Unigine Heaven benchmark and Diablo 3 as they both run on each OS. Under OS X the temperature never goes above 107 degrees. It seems OS X does not have this problem (as far as I can tell) because it never clocks the GPU into profile 4. If I use the NVidia performance tools under Windows to restrict the GPU to profile 2 then Windows also stays at a maximum of 107 degrees under normal game or benchmark use. Running something like MSIs Kombustor will still push it above 110 degrees. In OS X I can switch to the less powerful 9400 GPU, which stays below 90 degrees even when running the Heaven benchmark for extended periods.
Is there any way to use the 9440 in windows?
I installed more RAM (2x4GB), which is faster than rated spec(1333 vs 1066). But as far as I understand it the RAM will down-clock to 1066 anyway. Can anyone confirm this?
The battery is currently out because it is swollen. It is the second battery that this has happened to in this laptop. Are these batteries dying because of the heat, or is the battery swelling unrelated?
Has anyone else had these problems and managed to get them corrected?
What are the "normal" temperature ranges for the 9600M GT under game load? Can you please post your figures?