The P4 HT series run REAL HOT. One of Intel's downfall of late. You can mix the mem i believe BUT you will not be running at 400MHZ the mem will run at the lowest speed of all the sticks. 3 fans should be adequate but if you are out of spots to install your fan on your case then you are SOL if your not brave, if brave then make 2 mounting holes for the fan. I'd put one on the front to improve airflow. One on the side is overkill IMO. One thing you can do to protect your processor is to replace the thermal compond between your CPU and Heatsink/fan. Only do this IF you are computer hardware savvy. If you are go to newegg and buy the arctic silver thermal compound...you'll be amazed at the difference in CPU temp. That's all we use here now on our custom built pc's.
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