Is 4GB really my MOBO's RAM limitation?

Solution
From what I could see that is it 4gig. It is a very very old PC and they were very limited,by to days standard, on how much memory and such they could support. But back then 4gig was really alot of ram.

Mephikun

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Jan 8, 2013
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Yes. That is an outdated computer and generally older computers have much lower RAM limits.

Might be time for a new computer if you're looking to game at all. A decent custom build is probably cheaper than a prebuild.