Dust clogs fans and heatsinks, trapping heat and causing thermal throttling. A quick 8–10 minute vacuum, blow, and microfiber wipe restores both cooling and aesthetics. If you care about appearance, ...
I have an ASUS CUSL2 and a P3-800EB (133 FSB) which I've been running at stock speeds for about 1.5 years. I'd like to try overclocking it but before I do I want to do a better job with the heatsink.