I go with the single 570GTX. Two main reasons:
- your Antec Earthwatts 650 is not SLI certified
- if you go to Antec's PS calculator http://www.antec.outervision.com/PSUEngine
you'll see that one 570 recommends 592watts and SLI 460's 582watts. If you overclock the 460's to get extra speed they can deliver, you'll be short on watts and likely pretty unstable.
- SLI or Crossfire will raise the temperature of the top card 10 to 15 degrees C. You have a great case but I've tried SLI & Crossfire in Antec P182, P183, HAF-X, HAF-922, and Corsair 800D cases and found the increase in temperature in all of them.
Go with the fastest single card. With your current power supply a single 570GTX is your max.
You might also look at the new 560 Ti it'll need 524 watts and if you read a few reviews does a good job for less money... Dual 560 Ti on a 650watt supply isn't going to work, Antec calculator show 646watts.
The POST that indicated 400watts max would be drawn for the SLI pair of 460 SE's, needed to add some power for the rest of the system, like CPU, RAM, HD, DVD, keyboard, mouse, .. etc.
So it turns out that I can't step up my card. I'm pretty pissed about it. EVGA does not make it clear which cards you can step up. Some cards have different warranties than others which is complete BS. I paid $170 for my card from an authorized retailer(central computers) about 7 weeks ago and am stuck with it. Here is what EVGA said.
"Only parts that carry a limited lifetime warranty, or parts that have purchased an extended warranty, are eligible for EVGA's Step-Up.
Your product is a -TR product which carries a 2 year warranty and no options to Step-Up."
What the hell is a Tr product? really deceiving if you ask me.
I guess I'm probably going to have to get another GTX 460 SE and put it in SLI because selling it wouldn't be worth it. I have a Antec Earthwatts 650w, and that should be enough, though I could be pushing it....Argh....
Probably will have to do something to play Crysis 2 when it comes out. I'm gettin 75-90 fps on COD: Black ops with full settings(but anti liasing at x8)
Wish I did more research before I bought my rig. You live and you learn:/
your not in a bad position, 2 gtx460se in sli is pretty good. and your PSU is more than enough to run 2 of those cards with plenty of room to breath, you wont be pushing it much at all. i cant find any reviews of them in sli, but this is the 768mb review http://www.guru3d.com/article/geforce-gtx-460-sli-revie... in some cases your setup will be a tiny bit slower, in other situations (higher resolutions/larger textures) it will be a bit faster. either way you should be running a bit faster than a gtx480, which is pretty good.