In HL1 with my video card, framerrate is very "rough" (like a slightly variable lower FPS) constantly along the gameplay, HOWEVER with the weaker onboard Intel HD it's smooth as butter. In fact, more modern games like Bioshock Infinite, TF2, HL2, Unigine Heaven/Valley and more work better with the GT 520 as expected. How it's possible? Using 320.18 driver. Thanks EDIT: In fraps, with the 520 I get 30 FPS, with Intel I get 70 FPS Many thanks, I will try the 314.22 then .