I think you ought to find out which is slowing you down. Have you considered your CPU? Integrated cards do have a bad rep though.
Can you go into your BIOS settings and modify your multiplier so that your processor(alone) will run slower? (If the game slows, then it's the processor)
Can you slow down your memory buss to see whether memory speed is slowing you down? (adds weight to the argument that it isn't the graphics).
If you remove some of your RAM and the game doesn't slow down any more then you don't need more RAM.
If you increase the speed of the graphics buss and overclock your card you can see whether the PCI-e add on would help. (Hopefully you have a frame-per-second indicator in the game)
There are some other things you can do which I can't think of right now.
Good luck.
Can you go into your BIOS settings and modify your multiplier so that your processor(alone) will run slower? (If the game slows, then it's the processor)
Can you slow down your memory buss to see whether memory speed is slowing you down? (adds weight to the argument that it isn't the graphics).
If you remove some of your RAM and the game doesn't slow down any more then you don't need more RAM.
If you increase the speed of the graphics buss and overclock your card you can see whether the PCI-e add on would help. (Hopefully you have a frame-per-second indicator in the game)
There are some other things you can do which I can't think of right now.
Good luck.