Nah... had a bad stick of Kingston RAM (I'm not overclocking, so normally Kingston suits me fine... cheap & works
), so I ended up running some hardware diagnostics (PC-Check), in addition to stress testing it overnight.
I'd sooner think the "jerky" fps is related to driver issues, knowing the comments I've heard regarding Vista & NVidia's 8x00 drivers. A possible issue with SH4 not liking my dual core processor crossed my mind, too... but the issue hasn't bothered me to the point where I want to go digging real deep for it.
The jelly effect is just plain wierd... it seems to be fairly random as to when it hits, but it hits me most often when I'm running the 'scope up. Then it disappears *helpless shrug*. Once again, it hasn't bothered me enough to go poking.
I should mention that I've ran into FPS issues when I've moved the external camera real close to a burning ship... the FPS just bogs right down. But I had the same problem back with SH3, too, so I'm just blaming it on the graphics engine.
To sum it up, I'm too lazy and cheap to deal with any issues
