I cranked mine up from the start by using an IDE drive that already had windows XP on it. Just installed it for present rig. It cranked at ht1000. Later I set it at ht800 to get rid of a problem. My rig runs fast but it takes about 4 times longer to start windows. I can get it to run and OC
but the start up is so slow. It is probably a driver conflict from the old rig. But, I hate playing with drivers. I also read that you need SP2 for XP pro for the 3400.