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manumuskin - you're running an HP from what I saw in a prior post from you? If so, find the full model number (not just the series) and try searching that in HP's web site. HP normally has detailed specs sheets for their computers. As an example, my HP's laptop number is
L2105CA, but the front of it only says L2000 - on a desktop you'll be looking for a small label on the side, top, or back of the machine.
The other route you can go is download CPU-Z:
CPUID
We can help you choose ram if you can post a screenshot of the CPU, Mainboard, and Memory tabs.