Well it runs fine with the 8x and like i said the only performance problem i had when it was on 16xQ was the black screen of death. And yes, other than the black screen i had no lag.
But yeah, other than disabling motion blur and turning the AA down to 8x, all the other graphics settings are as high as DX9 will allow it. All the settings are on high. I have noticed that when you run the game on DX10 that you have the option to run everything on "very high" but i'm not sure how that looks though since the lag is so bad with DX10 that i never bothered to find out. I do run it on a 19 inch LCD widescreen monitor if the good performance has something to do with the size of the monitor.
Oh, and about my PC exploding...I was ROFL at that because my power supply actually DID explode about a year ago hahaha. But it was because it was defective. Thankfully nothing else was damaged lol. I think i'm able to push my PC so hard because i have about 8 cooling fans in my pc, one which is about 7 inches(on the top) and since i got central air in my house i tend to keep my PC next to an air vent when the ac is on WOOT