So, Nvidia’s GeForce 9600M GPU may not be causing the screen glitches that have been creeping up on some of the new 17-inch MacBook Pros after all. I know we like to tar and feather Nvidia, but this may just very well be an Apple issue or that’s what Nvidia want us to think.
“Our understanding is that Apple is investigating this, and if they need our help we will certainly support them. But right now it’s unclear what the issue is, so jumping to conclusions at this point is premature” NVIDIA spokesperson.
According to some Apple Support Forum users the MBP’s CPU and GPU temperatures can hover around 200 and 155 degrees F, respectively, which should trigger the fans to spool up to 3500 RPM from their default 2000 RPM setting but that doesn’t seem to be the case. There is a workaround, if only temporary, where you manually set the fans to 3000 RPM.