I'm scratching my head on this one. I just upgraded my system from a 8600gs to a GTX 460.
I've got a ECS MATX GF7100PVT-M3 MB, E7200 CPU, 4gigs mem, on Win7-64 - fresh install.
460drivers fresh from Nvidia.
Finding a few frame forward-back jumping, jerking/tearing every couple of seconds type issues playing Blu-Ray(ISO), DVD or avi (xvid/mp3) via PowerDVD 12-1618 in 3D-red/Cyan. DVD and avi less pronounced just flickering every few seconds. Occassional flickers with 3D off on all 3 media types. I don't have the 3d kit yet so its red-cyan. CPU monitor shows about 60% load on both cores. Running TriDef player in 3D red-cyan on all media showed no issues.
The issue appears to be PowerDVD12/GTX 460 related. Did the patches on Cyberlink - no difference.
The only possible cause might be the MB PCI-E is not 2x rather 1x. Researching, this was not to be an issue. Complete re-install of OS to just the bare minimum made no difference.
As a backup I paralled another 400w PS to the 4 power cables. Absolutely no difference. CPU's running 75% both cores. GTX 460 cool - I've ordered a Q9300 to try another CPU with a bit more horse power. If not that - then is=ts gotta be the MB.
Rechecking everything I found a BIOS update that's description was designed for a Rev 1.1 board (mine is 1.0) which I didn't apply. Trying that and everything is fixed - go figure! I went to the nearest mirror and cursed myself out!