Well, go ahead and try it, but I am pretty sure most benchmarks specifically try to isolate a single component to get the most objective rating possible. There shouldn't be much difference in the CPU test on a G5 with 128 MB of RAM vs. 2048 MB of RAM (theoretically of course). If your RAM is slow, it should show up in Xbench's RAM test, not in the CPU test. But like I said, it's always a possibility so maybe it's a good idea to try that anyway.
I don't know what else would be causing it, unfortunately.
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