The Mercury Graphics Engine (MGE) in Adobe Photoshop CS6, Photoshop CC and Photoshop CC 2014 will automatically use your computer's graphics card to accelerate filters, as well as other features like perspective warp, upscaling, focus mask, etc. All you need is a GPU that supports OpenGL or OpenCL with at least 512 MB of graphics memory, requirements which practically every graphics solution in the market meets.
If you are using a laptop with switchable graphics though, Photoshop will not automatically use your GPU to accelerate its functions. Instead, it will always use the integrated graphics solution, which is not only slower but saps some of the system memory for use as graphics memory. So even if we ignore the better performance of discrete GPUs, it's worth using them to free up system memory for Photoshop to use.
Let us show you how you can get Adobe Photoshop to use your discrete GPU, instead of the processor graphics or integrated graphics, for a boost in graphics and memory performance!
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