Originally Posted by Akkarin
heatsink is the stock one, I haven't had any trouble with stock AMD's in the past. Case is well ventilated - tornado case window fan, 2x 120mm fans (intake -> exhaust) and nothing in the way of the air flow.
Cpu fan is @ 3200 rpm
Case fan @ max rpm - forget how high the tornado goes
NB Fan @ approx 2k rpm
That's all well and good if your experience is good with stock coolers, but for good clocks on your 920 (think 3.7+) you'll want something with more dissipating power.
There are a lot of options - Corsair A50, CM 212+, Xigmatek S1283/S1284, etc; for not too much money. With a 920 you might need extra juice to get higher clocks and that's where the dissipation comes in at. Stock usually doesn't do well past a few hundred megahertz in clocking.