GTX 570 comes packing some incredible specifications into a sub-$400 card. It also incorporates all of the features from the higher end GTX 580 such as a vapor chamber-based heatsink and architectural improvements which lead to an overall increase in rendering efficiency. The result is a card which is roughly 25% faster than the GTX 470.

Performance:
Synthetic benchmarks generally aren't indicative of a GPU's real world performance, but they're an accepted industry standard, and can give us a general idea of how a card's performance will pan out in the real world. They're also an opportunity to stress cards in ways that individual applications can't, to really give us an idea of a particular component's operating range.
First up is Unigine's Heaven benchmark, a synthetic test for a DirectX 11 game engine (click the image to see the chart). It stresses tessellation, dynamic lighting and shadows, and offers extensive environmental detail. Nvidia has been beating the geometric-realism drum for some time now, so it's unsurprising that their card excels where geometry heavy tests are concerned. AMD has also taken note: their newer, mid-range card edged out its high-end predecessor, a nod to the 6870's improved tessellation engine.

3DMark 11

 We tested the cards at the Extreme (1920-by-1080 resolution) and Performance (1280-by-720 resolution) profiles. The GTX 570 maintains a lead over both cards, though the distance becomes less substantial under the Extreme settings. Of particular interest is the 6870, nipping at the heels of its beefier sibling.


Performance: Dirt 2


Codemasters' Dirt 2 is a DirectX 11-based rally racer, and features an excellent built-in benchmark. We used the retail version, with all of the details settings turned up to full.
Performance results here are similar to those we saw under the synthetic benchmarks: the GTX 570 leads the pack by as much as 45% over the 5870, regardless of whether or not anti-aliasing is enabled. The 6870 does an amicable job of keeping pace with the pricier 5870, aided in part by its improved tessellation engine.
 
Value and Efficiency




Performance across a spate of games -- including Just Cause 2 and S.T.A.L.K.E.R.: Call of Pripyat -- followed suit, with Nvidia's GTX 570 leading the pack, followed by AMD's 5870, and then the 6870. While the high marks look good for Nvidia, it becomes prudent to take cost efficiency into account.
By averaging our benchmark results for our real-world games tests and dividing by the price of the card, we arrive at a metric we call the Dollars per Frames per Second -- lower is better here. While the $350 GeForce GTX 570 outpaces the aging 5870, the $240 Radeon HD 6870 stands out as a pretty good deal. It may not post the strongest results, but solid performance (even in light of the competition) and that mid-range price tag give it a competitive edge.


AMD has yet to return fire on the high end of the GPU market, despite repeated assaults from Nvidia -- first with the GTX 480, and now with the GTX 580 and 570. With the holiday season upon us and enthusiasts eager to tuck new components into their chassis, it stands to reason that AMD's high-end retort is right around the corner. But until AMD's answer hits the market, shoppers in the market for a powerful part at a respectable price have a compelling option to add to their wish lists.

Source : PCWORLD