I just bought a new setup with a P4 3GHz, 512 megs of 400 MHz RAM and a pretty decent motherboard (ABIT IC7-G). Problem is, I have this serious heat issue. I know I installed the heatsink correctly, added the thermal compund, and added extra case fans, a better power supply and is still running around 70-75C!!!
I have considered adding a fan to the video card (radeon 7500 should not cause this serious of a heat issue), but that is reaching. Lastly, I have never seen a P4 run this hot before.