It's a funny old do, with graphics cards...

...!
I previously had, (have), an nVidia Ge-Force 4 Ti 64 sooper-dooper card....
Changed it for my current nVidia BFG 6600 GT OC 128....
The result in 3D Mark 01 is better, but a marginal difference in the Flight sim, regarding frame rates, (but slightly smoother)...!
The performances seem to be very close now between cards, and it's often difficult to notice the difference...

...!
Paul.
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.