On my mac pro i have been noticing for a while that when i scroll down or up on a page in safari and it seems to be limited to safari, you can hear the fans speed up noticeably. Why is this? I do not have SMC installed but even when i do the fans still do the same thing. iStat saya that my Power Supply fan is at 700 and same with my exhaust fan But the CPU and Hard drive fans always say 0. Should i do a reinstall? What is going on. It is very odd.