If he sees a drop in FPS then it's obviously your GPU. If not then consider all of the factors. What kind of ram do you have?
It's also possible that your bottleneck is due to your Northbridge on your motherboard. The Northbridge handles the transfer of data to and from your RAM and PCI Express devices. While I'm not sure this is where the problem is, it's always a possibility.
I have 5gb ot patriot 800mhz ddr2 ram and vista 64bit. How would i check if it is the northbridge cauaeing the problem.












