From Engadget:

No one's saying that $300 is "cheap," but compared to the GTX 670 and GTX 680 before it, the newly announced GeForce GTX 660 Ti is definitely in a more attainable category. The usual suspects have hashed out their reviews today, with the general consensus being one of satisfaction. A gamechanger in the space it's not, but this Kepler-based GPU managed to go toe-to-toe with similarly priced Radeon GPUs while being relatively power efficient in the process. That said, AnandTech was quick to point out that unlike Kepler reviews in the past, the 660 Ti wasn't able to simply blow away the competition; it found the card to perform around 10 to 15 percent faster than the 7870 from AMD, while the 7950 was putting out roughly the same amount of performance as the card on today's test bench. HotHardware mentioned that NVIDIA does indeed have another winner on its hands, noting that it'd be tough to do better right now for three Benjamins. Per usual, there's plenty of further reading available in the links below for those seriously considering the upgrade.

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It's taken NVIDIA a mighty long time to squeeze its Kepler GPU into something more affordable than the GTX 670, but it's finally happened -- the mid-range GTX 660 Ti is out and available to purchase for $299 on boards from EVGA, Gigabyte, ASUS and the usual suspects. Some buyers may complain that's $50 more than the 560 Ti, while others will no doubt be reeling off their CVV codes already. For its part, NVIDIA claims the 660 Ti is the "best card per watt ever made" and that it beats even AMD's higher-priced Radeon HD 7950 at 1920 x 1080. Check out the slide deck below for official stats, as well as for examples of what the card can do with its support for DirectX 11 tessellation, PhysX (particularly on Borderlands 2, which you may well find bundled free) and NVIDIA's TXAA anti-aliasing.

We'll wait for independent benchmarks in our review round-up before making any judgment, but in the meantime it's fair to say that this 150-watt card comes fully featured. For a start, it has just as many 28nm CUDA cores as the GTX 670, the same base and GPU Boost clock speeds, the same 2GB of GDDR5 and indeed the same connectivity. The only sacrifice is memory bandwidth: all that computational performance is limited by a 192-bit memory bus, compared to the 256-bit width of the 670. Judging from those specs, we'd expect it to be almost 670-like in performance, and that's going to be pretty impressive.

http://www.engadget.com/2012/08/16/nvidia-geforce-gtx-660-ti-review-roundup/

http://www.engadget.com/2012/08/16/nvidia-gtx-660-ti/

Newegg listing:

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&N=-1&isNodeId=1&Description=660ti&x=0&y=0

Head over to Toms Hardware for benchmarks.

Looks like Nvidia has done a fantastic job with Kepler. The GTX660Ti is apparently on par with a GTX580, and only $300. Pretty much a GTX670 but with 192bit memory.

Definitely the best card for the money.

This is a good card. But it's kind of stuck in no mans land if you ask me. It's not dirt cheap yet that you can buy it and feel like you got a bargain and it doesn't offer killer performance you wouldn't expect when spending 300 bucks on a video card. Its priced just right for performance it offers and looking at competitions pricing...

I only see people buying this at a large scale at around $229 price range...like they did with the GTX 460 and 560 ti.

Also, thanks to these new cards coming out, people are dumping their old 500 series cards on kijiji and ebay. Ive seen GTX 580 as low as 200 used. That's also something to consider.

Perhaps.

I'll possibly upgrade next month but unsure on which yet. Currently have a 550Ti which I regret. If I had gone with a 560 or 560Ti I wouldn't be looking at an upgrade.

Hehe...i currently have a 550ti in my machine as a 4th monitor/physx card to go with dual gtx580s, which dont support the 4th monitor ny themselves. I did some standalone benchmarks and 550 isnt too bad of a card. Itll run Battlefield 3 on Ultra at 720p and no AA. Most other games will run on 1080p and medium settings too.

I will definetly not be upgrading myself until next gen comes along. Infact ill probably remove the 550ti and put another 580 in there when they become dirt cheap. Tri sli should be fun...I figure i can always power an extra monitor with a USB to DVI adapter or use the PCI slot i have left over on the mobo.

I'm running two 5750s in crossfire. I wonder how much of a boost this would give me in performance if I just upgraded to one of these?

double your performance, maybe even more. but this is only if you dont have a cpu bottleneck.

no cpu bottleneck, but dang you really think it'll double performance?

I agree it's not a bad card, but in my situation (My monitor is 1080p and I want 2-4x AA) I should have gone with a 560 or 560 Ti for longer satisfaction. I can run all my games fine at 1080p 2-4x AA High/Ultra settings 30fps+ on avg, but I don't have any real demanding games aside from Crysis :P

I plan on getting Skyrim and other games soon, and I figure a 660Ti would keep me happy for a long time. I'm considering a 670 Too but it's overkill for me IMO.

Personally I am running a 7850, I don't see much difference between the two and I bought my card a while back. I just don't see much point and the lack of compute on Kepler is a concern for longevity with the next generation of consoles just around the corner.