Hey all, I just got around to playing New Vegas for the first time on this machine. I played fallout 3 to the death, and i rarely ever lose any frames below the 50's, unless for some demented reason i decide the MIRV needs to be fired fifty times into the sky.
I booted up new vegas, and right away, i was getting 35-40 frames in Doc Mitch's house, went outside, got extremely jumpy from the 40s-50-60 range, When i left town it was 55-60, but the minute anything that wasn't a rock came into view, my framerate plummeted from 60 to 30.
As far as mods go...
New Vegas has Project Nevada,
FO3 has FOOK + FWE + MMM + Enclave commander + Darnified UI.
My system specs are as follows: AMD Athlon(II) 645 Quad core processor, A Twin Frozr II 560ti (2gb) and 6gb of RAM.
For what it's worth, i think it might be a CPU issue.