CPU performance problem

This is so amateur question, but please if someone had similar problem...
I'm trying to get some gaming from my old PC with nvidia 9400gt 1gb.
I play older games, so I don't expect miracle to happen.
But when I put GPU in athlon x2 4400 (2.3ghz) with less RAM, game can run smoothly.
In my PC with pentium DualCore 945 (3.4ghz) and 4gb RAM I have same problem like using 512mb GPU radeon 5450hd.
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