A 5150 isn't going to run it nicely any way you look at it. The memory sharing is just a symptom of the bigger problem that it's just not a very good video card. The FX series just ain't great, and while an X1300 is no beast, the 5150 is more or less a leper.
At any rate, unsharing the memory isn't going to happen. It's basically borrowing system memory for texture storage - so unless you decide you don't like textures, you're not gonna change that.
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