A good read for what makes this new card tick (with benchmarks etc; it is very similar to a 670, the already limited memory bandwidth was slashed*, the casualty of making a new price bracket out of this GPU).
Which did this to the benchmarks vs the full memory bus on the GTX670 (at $400 vs the new card's $300).
And it makes the comparison with the new AMD card released to stores tomorrow (but called the same name as the card you don't want, the AMD 7950. You want the new one with Boost if you're buying AMD for $330) even more of a winning 6 of one, losing half a dozen of t'other (by quite some margin in the games where one design is clearly better). The only thing I would say about AMD is their new card uses about 60W more power under load to get this competitive performance and while it is dissipating that heat it is about twice as loud as it spins the fans up (+10dB = doubling of volume due to log, not linear, scale).
So at $300-330 we have two brand new cards coming to shops in the coming days and weeks and showing both major PC GPU manufacturers tweaking the designs they've been bringing to market over the last calendar year. nVidia is low power, low noise, and agile but the memory bandwidth is crippling (even vs last gen parts it is a step down) so some games really hurt while others use the power that is there to scream along. AMD are fighting at that price with a very good card that goes big and pays for it in noise and heat but clearly has nVidia crushed in games that want as much memory bandwidth as they can get. If you only play Crysis then you'd be crazy to think the 660Ti was good value; for BF3 then the 7950 Boost is $30 more expensive and 20% slower (1080p with FXAA) and even worse in Portal 2 with SSAA on. They're both good cards with very different strengths and better value than the $400-500 cards above them (if you can't justify throwing money at making all games sing at max settings).
* Memory bandwidth = bus size * memory speed so the $300 660Ti is 192bit * 6GHz (670 was 256bit * 6GHz) while the $330 competition from AMD is 384bit * 5.5GHz so AMD have a whole lot more memory bandwidth even though the headline frequency number is slightly lower.
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