Ok, this issue has had me pulling my hair out of my head for weeks now. First, here are my specs..
AMD a64x2 4800+
MSI k8n nforce 4 platinum sli
2gig OCZ ddr400 (running default spd timings)
two EVGA geforce 7800 gtx cards runing sli
Audigy 4 platinum
Running windows xp pro with sp2 built in. 6.66 nforce drivers, and the 77.77 video drivers. Stock cd audigy drivers, because like someone said in here earlier, the update from the creative site always breaks something. Now, when i first built this machine, i didnt know the amd driver existed, and just went along with the normal installs. Doom 3 ran fine, half life 2 ran fine, BF2 ran fine, wh40k DoW ran fine. Eve-Online and ground control 2 ran fine, but after alot of playing i would get the jerkiness problem. Rebooting always fixed it. Everythign was running rather well except that, which was getting annoying but wasnt major. I ten go to install an older game , Independence War 2: Edge of Chaos. Crashed out initiall, but the patch for the game seemed to fix that. But then after that i would have issues with the fmv cut scenes where it would run horribly choppy or hardlock the pc focing manual reboot. Checked around here, and was suggested to install the amd driver, which i did. It instantly made the problem with eve online worse, in that i would get the jerkiness immediately right off of a fresh reboot. This bothered me alot as eve online is the game i play most of the time. So i go nuts changing around drivers, and trying a suggestion or two mentioned in a thread i had made on the tech help forum here. Nothing worked. So finally i figure ill do another fresh format, installing that amd driver first, and going from there. No go, same issues i had after installing the driver on my first install. Installed a few other games besides eve, wh40k: dow still seems to work ok, and the starting fmv in the beginning seems smoother, half life 2 still has no issues, and with i-war 2 the fmv in the beginning was smoother, but i had jerkiness in the game itself.
Setting cpu affinity using ROPE gets rid of the jerkiness in eve, and i-war 2, but since going that route i get random BSOD in eve, and i-war hardlocks the machine the instant the game tries to go into a cutscene. The BSODs worry me, as i havent a clue was causing them.. i spent a day or two testing stability on the recent install with the x2 drivers using prime95, ran the memory test 11 hours before i turned it off, and ran two instances of the prime cpu (max fpu test) test, one set for each cpu core for 14 hours before i turned it off. No problems whatsoever. I really dont know what to do anymore, system always auto-reboots on the bsods so i cant get a good look at what it says, and it only seems to do that in eve, apparently whenever i set affinity, doesnt matter which core i set it to. It happens at random intervals.. first time i set affinity it blue screened me right there, then i tried it again after the reboot and played fine for 3 hours, where it then blue screneed me twice within 15min, then fine for another hour and a half before i quit for the night. I-war 2 just seems to refuse to work, ill have to see if there are any official forums for that game anymore , maybe someone has a fix. Bunch of people on the eve forums are experiancing the jerkiness, but didnt know what do do, till i told them about the affinity deal. No word yet on if any of them are getting the blue screens as well.
Hope this helps, and any help anyone else can provide would be greatly appreciated.