After I applied some new thermal paste on my CPU (not the GPU), I noticed considerably lower temperatures, especially during load. However, my average temperature when browsing websites (like Macumors), is about 50 C. My fan is constantly on. When I watch Youtube or play some Warcraft, the temperature can increase up to 55 C. Are you guys experiencing similar temperatures? How is your fan noise? Also, I just noticed, my GPU is really fricking hot. At idle, it's almost 7 C hotter than my CPU. When I play games, it's almost 10 C hotter than my CPU. Is it worth it to open up the Powerbook again and apply thermal paste on the GPU as well?