[Solidstate89]

You know, as embarrassing as that is, I haven't though of running only one 470. I should go disable SLI and see what happens. That still doesn't explain why it worked fine for the first 5 hours on Monday, then began lagging.

I also haven't overclocked my i7, and I brought my 470's back to stock clock levels because I know the clock frequencies don't really give that much of a boost to 3D Modeling Programs.

And before you ask, I have tried running Inventor with Hyper Threading enabled and without. I haven't noticed a positive or negative difference with either setting.