So for a while now, my Sager has been heating up more and more while gaming, and GPU fans would not shut up. Last night I decided to try and take it apart, removed the fans, blew them out with a can of air along with the heatsinks. Put it back together booted it back up, and now its running like new. Its a laptop with Dual 5870's in CrossFire. 43-47*C on GPU1 on idle when before it would sit about 60*C, and the fans will actually kick down instead of sounding like a jet all of the time. However, GPU2 seems to be kind of faulty. What I mean is I usually monitor it with MSI Afterburner along with my FPS and GPU usage while gaming to make sure its not getting abnormally hot. Within seconds MSI Afteburner said the GPU went from about 47*C to about 80*C within seconds. My first thought was the fan, which I knew I plugged back in. Closed the game and I could hear the fans on. Also put a small piece of tissue under both intakes on the bottom and it was sucked up towards the vent. Fan works. So I monitored MSI Afterburner and at times it would show my GPU2's temp. was 0*C, which I highly doubt its on and sitting at the freezing point of water... And the fan speed would drop to 20%, which I initially thought was the issue for it running hotter while idle than GPU1. If I open GPU-Z and monitor it, it will show GPU2 is at 65*C or so, when idle. Give it a few seconds and it drop suddenly to 51*C, when GPU1 is running about 48*C. As #2 as usually run a couple degrees warmer than #1, I'm assuming this is the actual temperature, and previous temp. were false. I had also tried installing different drivers. Previously had 12.3, and found a download for 12.5 beta up, but I dont think it was actually 12.5 as MSI still reported 12.3. I went back to 12.1 which was the last driver version I had before reformatting my laptop a week or two ago. My question being is it the actual sensor on the GPU itself, or maybe driver software that could be screwing around with my temperature readings? If the temperature slowly declined I would assume its just the fan doing its job, but its an abnormally quick drop of a few degrees within a second, which makes me curious. Dont really know how sensors work in GPUs so I'm asking here. I would reformat again or download a Linux distro and install some temp monitoring software there if I knew it would help. I also played SWTOR on it yesterday while alt tabbing to check HWMonitor (which only shows 1 GPU) and GPU1 only got a little over 60*C after playing for a while, and not any hotter than that. Also the side of the keyboard where my GPUs are under, the backside of the laptop, and underneath are much cooler to the touch. Any help to resolve this would be much appreciated. I know its not something huge but I would like to still monitor my temperature and get accurate readings. Thanks in advance.