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After installing a nvidia graphics card in a pcie slot, the memory subscore jumps from 5.9 to 6.7. Could this have to do with my previous integrated graphics using some memory. I have 4 gb of ram dual channel installed, ddr2 800 mhz.

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Yes, exactly, integrated graphics cards often share system memory, and you have removed both the use of that memory and the contention of the GPU and CPU using the same memory.

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So does this mean that shared memory (intel integrated) is not preallocated and that it slows down overall memory performance? – agz Jan 23 '13 at 4:10
Actually, it is allocated, and unavailable to the OS, but it is still the same physical memory, with two separate systems requesting and writing to it. – Paul Jan 23 '13 at 5:18
Ah, ok. So the windows experience index calculates that two systems writing and requesting the same memory is slower than if just one does. – agz Jan 23 '13 at 6:59
@agovizer I don't think the details of the index calculation are public, but I imagine it just subtracts "a bit", rather than doing anything scientific. – Paul Jan 23 '13 at 9:11

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