Here's my experience thus far ... the system: Asus P5B-E, E6400 (not oc'd, yet), 2gb Patriot DDR2 800 (PC2 6400) ... etc. etc. in an Antec Performance II case... was running idle around 42-45c with the stock cooler and AS5. Now, on to the Infinity... the fit is tight no matter how you cut it...