The card supports DX11 as well as DX11.1, Open GL 4.2, PCIE 3.0, up to 3-way SLI support, 3D Vision Surround and PhysX. The memory is 2GB GDDR5 (6008MHz effective speed) running on a 256-bit memory bus. IT also features 1536 shader units or CUDA cores, which is three times what the GTX 580 had. ZOTAC follows the reference card specifications, so the core now sits at 1006MHz (base clock) and the boost clock is set to 1058MHz. The two new AA modes (FXAA and TXAA) are said to offer similar quality levels as MSAA, but without the huge performance hit. For instance, if you’re getting more than 60fps, then V-Sync will be on to avoid screen tearing and if it dips below 60fps, then it switches it off to avoid stuttering. Adaptive V-Sync can now be found in the Nvidia Control Panel and what it does is, dynamically toggle the V-Sync state depending on the frame rate. This keeps changing as you play the game and is built into Kepler itself, so it kicks in by default. For instance, if there is an intense battle scene in the game which demands more shader power, the built-in algorithms will automatically check the current power draw, temperature, voltage, etc of the card and accordingly increase only those parameters that can be pushed. GPU Boost is similar to Turbo Boost, in the sense the card will dynamically increase the clock speeds and voltages in a game, if and only if, it does not go beyond the set TDP.
Nvidia have added a bunch of new features to the GTX 680, like GPU Boost, Adaptive V-Sync and some new Anti-Aliasing (AA) models. This makes it a bit tricky installing the second one, which is a bit recessed. While they’re still placed at the back, face outwards, they are now placed one below the other. The GTX 680 also features a slightly different arrangement for the power ports. The GTX 680 can now support up to four monitors from a single card, so we have two dual-link DVI connectors, HDMI 1.4a and DisplayPort. Only two 6-pin power connectors are needed
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