NVIDIA GeForce driver 531.79 Game Ready.

However, there are some features that will not work without a supported video card. In most cases the acceleration is lost and the feature runs in the normal CPU mode. If you do not have a supported card, performance will be degraded. In order to use MGE, you must have a supported video card and updated driver. It does not use the proprietary CUDA framework from nVidia. MGE is new to Photoshop CS6, and uses both the OpenGL and OpenCL frameworks. The new MGE delivers unprecedented responsiveness for a fluid feel as you work. In Photoshop CS6, this new engine delivers near-instant results when editing with key tools such as Liquify, Warp, Lighting Effects and the Oil Paint filter.

The Mercury Graphics Engine (MGE) represents features that use video card, or GPU, acceleration. The Mercury Graphics Engine (MGE) is the new engine graphics engine in Photoshop CS6 and is based on both OpenGL and OpenCL ( source):

Thanks to OpenCL, most of the GPUs (and CPUs too!) already present in the market will be able to take advantage of the new GPU computing functions implemented in Adobe’s Photoshop CS6 to speed up processing. Other parts of CS6 (After Effect, Premiere) continue to use NVIDIA CUDA technology (Mercury Playback Engine). Nice news for the OpenCL community: Adobe has added the support of OpenCL in the new Creative Suite 6, especially in the Mercury Graphics Engine (Photoshop CS6).

Adobe creative suite 6