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You'd see a marginal increase in performance (maybe 5-10%). It's true that better performance results from having matched RAM and CPU speeds, but having MORE ram is almost more important than having synched RAM. This is theoretically incorrect but tends to be the commonplace. Your speed difference is rather big, however, so buying the correct ram speeds will probably yield better than average performance (hence my 5-10% estimate).
Summary: if you buy more ram, your system will run faster, but games won't increase in performance that much. Benchmarking applications care more about the synchronization of your ram and CPU while games care more about how MUCH ram you have.
I consider 512 MB of RAM in today's games unplayable with the settings I want. Your lag is likely being caused by a shitty videocard or a simple lack of adequate ram.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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