The Radeon 5450 should be fairly equal to the G210, perhaps a little quicker.
I wouldn't bother paying much attention to the Windows experience index if I were you. It isn't very accurate and can come up with some strange results. Eg, it gave my Radeon 4870 512mb 7.2, yet the Radeon 5850 1gb I now have only gets 6.9 - clearly the latter is far superior (and has proven to be in games), but WEI doesn't think so for some reason!
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