The newer one will be faster as it is a much newer GPU. I presume you're running relatively low resolution and have your MAXFPSBK set to like 15? With the new graphics card being in a desktop and not a laptop means you're going from UMA graphics to discrete. I would expect you'll see 60+ FPS on all 3 with the settings turned up to high and set to higher resolutions. The jump from UMA (shit) grahpics to discrete is like going from old PCI VGA to PCI-E; it's so much faster as to be in a whole new league.