Call of Duty: Black Ops Stuttering / Lag Spikes / Frame Drops

I've uploaded a video that shows the type of stuttering/lag spike/frame drops that I have been dealing with since the release of the 12/14 patch. Before the 12/14 patch, I was able to run Extra texture detail, 16xAA @ 120+ FPS. The stuttering only happens when I set Texture Detail to 'Extra'. When I set Texture Detail to 'High' with 8xAA I get no frame drops. I've also noticed since the 12/14 patch, that the map does not 'fully load'. Little things like, trees, rocks, parts of buildings and additional background/foreground (essentialy props) to the map, only appear when I come within a certain distance. I also have noticed, when these 'props' appear on the map it causes a lag spike -- i.e stutter. Not to mention, my variances in frames ranges from 10-250 FPS (with Extra detail).

By uploading this video, I am hoping somebody can help me make sense out of what the lag-o-meter is reporting here and hopefully this will shed some insight to other people experiencing the same issue.

Note:
Zombies SP/MP, Single Player/Campaign and Combat Training all play perfectly with 0 lag/stutter with Extra detail, 8xAA. Only MP has this stuttering issue.

PC Specs:
AMD Phenom II x4 @ 3.64ghz
6gb G.Skill ddr3 @ 1748
2 Sapphire 4850's in CrossfireX
300gb WD Raptor

http://www.youtube.com/watch?v=4UqVBFJZ328