I have the same CPU (4200 x2) with 1GB Ram and a Leadtek 8800GT 512 graphics card factory overclocked with the Zalman cooler. I usually get 180FPS at TC 1 and 7 FPS at TC 8192 until I start sinking ships Then 7FPS drops to TC 4096. I also get between 40 and 60 with the free camera or Periscope and 110 on the sub's interior. I run somewhere between high and medium graphics settings (I set Character detail to low) and all the boxes checked except EE. My game resolution is 1440 x 900 at 75 HZ.
Your system should be able to top the numbers I get with all that RAM. There must be a problem somewhere. Have you tried the Nvidia tweaks on the forum and setting the core affinity to core 1? I run the bare minimum of XP services and usually have 800MB of free RAM. Check and see if you have some memory hogs running on your system.
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