Recently took apart my MacBook Pro. Reapplied the thermal paste close to a week ago. My MacBook is an early 2011, 2.3ghz, 16gb Kingston HyperX RAM @ 1600mhz, AMD 6750M, Intel 120GB SSD and a WD 1TB in optical drive bay.
Here's my temperature when running Hanbrake at full load. GPU however isn't used I don't think.... at least not much. 3 tabs were open in Chrome.
Click on image for full size.
Initially when I started conversion, temperatures reached 96C, but fans turned on fairly quickly and reduced the heat down to the 80C mark which is steadily holding on to this for the last half hour.
Idle temps vary, if not doing anything at all, eventually the laptop cools down to 40-42C.
These numbers are also using a 24" external LCD connected via thunderbolt and the MacBook Pro closed in clamshell mode. When not in clamshell and using the MBP's internal LCD only, idle temps can hover around 33-39C.