New CPU issues

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I got a new CPU a while ago, put it in and it ran fine until I tried to run any game, as soon as the game would start the computer would freeze, I thought it might be the power supply so I got a new one, an Antec Truepower 2.0 430 watt PSU. I ran a power calculator test and it estimated I need around 300 watts, so that should be ok, but it still freezes when in any game.

The old CPU was a Celeron 2GHz, the new one is a P4 2.8GHz (SL6PF), running Windows XP, 1.5Ghz of RAM.

The other problem I'm having with it is when I check the CPU in my system properties, it shows it's a 2.80 GHz, right underneath that, it shows 2.10 GHz

I've also tried re-installing windows, same thing happens.
 
1. a 300 W PSU doesn't necessarily put out 300W. Always go bigger for cushion.
2. IS your BIOS up to date? By changing the PSU, there may be additional requirements.
3. Are all your drivers up to date?
 
Could your video card have malfunctioned? Maybe you bumped it or something.

Check to see if the capacitors are leaking at all, and also check the temp of your card if you can while it's running intensive games/etc.
 
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