I just wanted to add, agree with another post (can't remember the name) it does seem the 600m gets worst and worst over time.
You would think cause it is the dust, but when I checked after getting a slow game again and extremely hot bottom, there was barely dust there.
Its like I have to add more and more cooling to fight against the worsting cooling system.
I reapplied the AS5, and removed what little dust was there.
This is really pissing me off!!!!!!!!!!
P.S. since moving to my dorm I don't seem to have that problem much anymore, but I run my room really cold!