That's good- stock cooling from the retail box is fine when you're dealing with a non-overclocked system. I built my box a little over 2 years ago, and it's running a P4 2.0 @ 2.5 GHz, 1.600V. The idle temperature of the CPU core sits right at 30C, and 100% load never goes above 40C. If I got off my lazy ass to flush the coolant system and refill it, I would probably run about 3-4 degrees Celcius lower across the board. It's whisper quiet too.