I've seen a few threads from people who have replaced their thermal paste on their rMBP 15", but never saw any before and after. I'll report my numbers in the event no one else has yet. I didn't do anything elaborate, but just food for thought. Oh, and I only tested in Windows 7 on Bootcamp. GPU stress test program: OCCT CPU stress test program: Prime95 Thermal paste: Prolima PK-1 Here's the max temps after 20 minutes of stress: Before: 101 105, 105, 101 for CPU, 89 for GPU After: 99, 100, 97, 93 for CPU, 85 for GPU Not a major difference, but still worth it for those with a couple minutes, the necessary tools, and motivation.