Over the years multi-GPU performance scaling has increased a lot, next to many driver improvements. It was no surprise to see the GeForce GTX 560 Ti perform the way it did. Ever since the release of the 400/500 series SLI performance with two cards has been phenomenal. Where you'll quickly run into some CPU limitations on cards like the 570 and 580, this 560 Ti seems makes a lot of sense combined with a decent modern processor.
So performance wise, little negative can be said about the GeForce GTX 560 Ti setup in SLI. Heat and noise will hardly go up depending on your configuration and remain very acceptable. If you can, please place the cards as far away from each other as possible, a special flexible SLI bridge is required for that though, like the one shown on page two of this article.
Power consumption then, the two GPUs consume roughly 300 Watt, add to that the rest of your system (processor, chipset peripherals) at say 200 watt and you'll find yourself in the 500 Watt power consumption region. If you plan to overclock CPU and GPUs, then make sure you add another 200W on your PSU requirements. Keep that in mind okay? This is the extreme high-end arena, it never has been any different. It's just that over the past years we all have become much more critical about this topic.
Scaling with the more GPU stringent monitor resolutions starting at 1600x1200 and modern games you can gain 1.6x ~ 1.9x performance with two of these cards and that really is commendable.
Bare in mind, to be able to operate two or more cards in SLI mode you'll need a SLI compatible motherboard, most X58 motherboards are SLI certified, some P55 motherboards as well. And pretty much any P67 motherboards will also carry SLI support. And sure, that or an older nForce motherboard (which is a dying breed). But carefully make sure and check that out before opting for SLI.
Driver compatibility - In all our test we had no driver issues whatsoever. All games worked straight out of the box and all games show good performance scaling.
So there you have it, two GTX 560 Ti cards setup in SLI will still cost you say 480 EUR, and that's a truckload of money. In that same price segment you can also pickup a more convenient GTX 580. With SLI you might run into some sort of small driver issue at one point in time, also compared to the GTX 580 you will consume more power. The flipside of the coin however is that the performance beats any 'single GPU' graphics card tested to date.
Whatever you preference might be, either way we doubt you'll regret the choice you will make as this certainly has been a pleasant experience from A to Z. Definitely recommended.
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