This much I guess?

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Despite having 6GB on the card only 3GB seem to be used as indicated on screen and in the logs and the rest goes to slower (?) virtual memory. Is that right?
If so, is it possible and is there any sense removing this limit to eliminate virtual memory calls? Probably a DX9 (or DX8) limitation.
Just looking to squeeze that extra little drop of performance that seems to be just out of reach.

Attached Files Shot12-04-17-19-57-46.jpg
"Take the cylinder out of my kidneys,
The connecting rod out of my brain, my brain,
From out of my arse take the camshaft,
And assemble the engine again."