Here are my specs:
OS: Microsoft Windows 7 Professional
System Type: x64-Based PC
Processor: Intel(R) Core (TM) i7 CPU 920 @ 2.67GHz (8 CPUs), ~2.7 GHz
Memory: 6144MB RAM
ATI Radeon HD 4350
For example, I'm currently only getting 25-35 FPS with OptiFine on Minecraft, if that's any help.
Also, could you list some of the graphics cards that you would recommend?