I'm upgrading from an i7 920 running at stock -- and this is a massive increase in performance. I know that the 1366 architecture isn't the latest and greatest, but I wanted a hexacore processor without also having to upgrade my motherboard and ram, so I chose this chip, and for me, it's a good upgrade. I figure this chip will keep me happy for at least 2 more years, at which time I'll be going lga 2011 (or whatever is the latest and greatest at that time)
Using Daz Studio Advanced 64 bit, a test render of "Fiery Genesis", (a pre-made, ready to render 3d scene that comes with the program to showcase what the software can do)took roughly 37 minutes on my i7-920, but this beast churned through the same render in 3 minutes and 37 seconds! Wow. I was just blown away to see such a huge bump in performance, and, despite the high price tag of this processor, for me the massive increase in rendering performance was well worth the cost. I'm aware that I could've overclocked my 920 -- just as I could OC this thing, but, in a word, I'm chicken. Even if the thing ran stable, I'd be so paranoid that one day I'd go to turn my PC on, only to see thick black smoke coming out of it. So I run stock, and it gives me peace of mind.
I'm running this on a Corsair H60 sealed water cooler, and my temps match the 920s idle, and at load -- mid 30s at idle, and about 45 under sustained load -- this is with the thermal paste that came with the processor. I may go back and try again with Arctic Silver, but that's a project for another day.
All in all, if I were building from scratch, I probably wouldn't choose the 1366 architecture at this point. However, in trying to squeeze a little more time out of my existing investment, it made sense for me, and for what I use it for, the hexacore processor made sense. I'm not really a big gamer anymore, so I'm not sure this thing is the best processor for that. Most PC games are just ports of games optimized for 5 year old console hardware anyway, which even the 920 was more than capable of handling.
I know a lot of people publish their PC specs, but I'm not in front of the 990x PC right now, so if you guys really want to see my specs, I'll edit the review and post them.