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I've spent quite some time with the Asus GTX 660 and I confidently say that it is the best graphics card in it's price range. My 660 has no problem running all the latest games, Metro: LL, Crysis 3, Sleeping Dogs and any other game I have on my PC at an incredibly high level, normally either the highest available or slightly below on top tier games like Battlefield 4. The card is capable of running the majority of games at around 60-90fps whilst often going into triple figures.
Size. The card is in fact pretty big, I had to upgrade an old bitfenix case I'd been using for years in order to fit it in well. The card did fit in my smaller case but it was quite a squeeze, I'd recommend investing in a bigger case to fit a high end card, you don't want it getting damaged. In the larger case it fits in perfectly without even coming close to hitting any other parts. If you have a smaller case, however, I'd recommend getting out the old measuring tape and making sure it'll fit. The size is listed as 10.7 " x 5.4 " x 1.7 " Inch on the Asus website for reference.
Heat. The card runs pretty cool in my air cooled system, and even cooler if you pair it with a water cooled system. The card normally runs at around 27 celsius in my regular air cooled system with regular internet browsing and word processing. When gaming the temperature does go up but the gaming temperature varies a fair bit, so I'd be hard pressed to give a solid number. If you're worried about heat you could invest in water cooling but I personally don't think it's necessary.
Power. This is one powerful card for it's price range. Paired with an Intel i5 in my secondary machine the GTX 660 has no problem running the most modern games on the market and will no doubt be able to run new games that come out in years to come. The average GPU voltage according to ASUS GPU Tweak, a software bundles with the card, is around 860mV as a reference point if you are concerned about the voltage.
Overall, the Asus GTX 660 is an excellent card for it's price range, it's not quite a Titan but it'll be able to run the latest games to all your needs. The temperature is great and the overall build of the card is excellent, it feels sturdy and well made. This card is definitely worth the money and I've had no problems with it since purchasing it. I wouldn't hesitate to buy it again if I were given the chance.
Aside from maybe the Nvidia 780, this graphics card is the best you can get. This graphics card will run you at maybe 270 dollars, and for the performance of this card, that's a pretty good price. What can I say about this card? The next generation games can run on this card, and for some Battlefield fans out there, this card can run the game at a pretty good resolution. And with the bundle of a game, this is a pretty good deal, considering that Splinter Cell: Blacklist is a pretty solid experience. This card is all the more useful if you enable SLI and have a another one of these installed, as well. The performance of dual 660ti is very good for the price, the only dual graphic cards duo that can beat this one for the price is probably dual 760's. Is this future-proof? If you're talking about dual GPU's, then it's possible, yes. If you're talking about this alone, then probably not. Battlefield 4 and Call of Duty: Ghosts are pretty demanding when it talks about the recommended graphics card, but remember, the line of next-gen games has just started. Be careful when talking about future-proof.
i**While stocks last; for retail customers only; Buy this graphics card to get a free voucher good for one digital download of Splinter Cell: Blacklist PC game./iClaws out-time to game!!Feel the Power of GTX660 TI with fantastic ASUS...