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You need MSI afterbuner http://event.msi.com/vga/afterburner/download.htm once installed head to settings/monitoring/active hardware monitoring graphs, from there check the GPU usage tab and highlight it, an option below will let you check a box to " show in on-screen display ".
thanks for that. im only running a gts 250 (9800gtx+) at the moment with physx on medium but il soon be getting a gtx480 and use the gts 250 as dedicated physx.