My system specs aren't that much different, I could probably pull those frames off (or very close to it) if I had the correct PSCX2 setup.
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[-AMD Opteron 165 @ 2.9Ghz -]
[-DFI LAN Party UT uNF4 Ultra-D-]
[-AData 2GB (2x1GB) DDR400 2-2-2-5-]
[-eVGA Geforce 8800GTS 640MB 320-Bit-]
[-Creative Sound Blaster X-Fi XtremeMusic-]
[-Seagate 160GB & 250GB 16MB Cache SATA300-]
[-WinXP Pro x86 & WinVista Ultimate x64-]
[-OCZ GameXStream OCZ700GXSSLI-]
[-Saitek Eclipse II & Logitech MX518 & Ratpadz XT-]
[-DELL 2005FPW LCD Monitor via DVI-D-]