הכל מוסבר פה...
Graphics Processor Settings: Photoshop attempts to auto-detect your video card and lists the make and model, if Graphics Processor is checked. Click Advanced Settings. Select your desired drawing mode from Basic (least amount of processing) to Normal to Advanced (most processing). If Photoshop isn’t running smoothly, switching drawing modes may help.
If Photoshop couldn’t detect your Processor, but you have one, select the Use Graphics Processor to Accelerate Computations. Select Use OpenGL to enhance the performance of your graphics display and speed up your screen redraw.
If some of your tool cursors don’t appear while you edit an image, try deselecting this option to see whether it fixes the problem. You must select this option to enable viewing options, such as flick panning, animated zooms, and the Rotate View tool. If your guidelines, gridlines, and paths appear too heavy, uncheck this option.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
GPU/OpenGL preferences in Photoshop CC and CC 2014
The advantages of using a compatible video card (GPU) with Photoshop are that you can experience better performance and more features. Problems can occur if you have an older video card with limited VRAM. They can also occur if you use other programs that use the GPU at the same time as Photoshop.
Choose Edit > Preferences (Windows) or Photoshop > Preferences (Mac OS).
In the Performance panel, make sure that Use Graphics Processor is selected in GPU Settings.
Click Advanced Settings and specify the following options:
Mode > Basic
Uses the least amount of GPU memory and enables basic OpenGL features.
Mode > Normal
Uses more GPU memory and enables GPU-based color matching, tone mapping, and checkerboard blending.
Mode > Advanced
Provides the benefits of Normal mode as well as newer OpenGL advances that can result in improved performance.
Use Graphics Processor
to Accelerate Computation
Use OpenCL
Uses the GPU to accelerate the new blur filters. OpenCL is only available on newer GPUs that support OpenCL v1.1 or later.
Anti-alias Guides And Paths
Allows the GPU hardware to smooth the edges of drawn guides and paths.
30-bit Display (Windows only) Allows Photoshop to display 30-bit data directly to screen on video cards that support it
