Intermittent FPS drop with SLI enabled post 2.1

[Riv]

The past few days, I've noticed my FPS dropping drastically (from like 100+ down to 30-40) and then right back up over about a 1-2 second time frame. This happens about every 15-30 seconds while in game. It also does not seem to matter what is going on on screen, though obviously I notice it more when I'm running around or in battle (solo or large groups, doesn't matter). It's extremely obvious and very annoying when it happens. The problem only occurs when I'm running in SLI, and I'm not temperature throttling either because the cards are only at about 60C.

I'm using 2 GTX 670 with the most recent drivers (331.82) and it was doing this even before I updated from the previous driver. I wonder if this is happening to anyone else? At first I thought it was my system or my SLI bridge, but every other game is working fine.

Also on an unrelated note, has anyone else noticed the in game frame rate limiter is now broken? I can set it to limit to 30 or 60 but it doesn't work.

Now that I think about it, it actually seems like it's only been doing this since the last hotfix rather than 2.1 itself.