The system supports speeds of 400Mhz, since when I had only 1 Gig of RAM, it was running at 400. However, since I do have an AMD system, I'd think the most likely possibility is the one Thermo mentioned, the system slowing it down with there being 2 Gigs installed. I'm not sure WHY it would do this though...
Will also check BIOS settings later.
Thanks!

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