Hi MavTech,
I have a stock P4 2.53ghz on a GA8-INXP with a stock heatsink and fan. The temp in the room is 21.5degC (70.7degF) and the cpu is running at 25degC (77degF) according to MBM5. The fan on the heatsink is running at 2556rpm. My case is a Lian Li PC-65B. It has two fans up front, one exhaust in the back and one blow hole on the top of the case. The power supply has dual fans as well. The inside of the case is at 22.7degC (72.7degF). The hottest the cpu ever gets is 42degC running hours of flight sims, NASCAR 2002 or Metal of Honor. I built the system myself in January of 2003 and I'm quite happy with it.
I hope this helped, 🙂