Hello!
It is not just the CPU that determins system speed. It is also memoryspedd bus speed of the Mobbo, internal settings in the BIOS and ofcourse also the speed of the HD and graphic card!.
But the fact that your PC now runns faster with your moms XP1800 then with your XP2100 indicates a bad CPU. Maybe you have overheated the old one and made it less efficent as a result. Or it maybe was not cooled enough. The faster XP2100 maybe require a better CPU fan.
There is probably even more possible causes do you still have a warranty if so then you have it checked?.
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