The layout of the graphics pipeline, in terms of functional units. Over time the number, type and variety of functional units in the GPU core has changed significantly; before each section in the list there is an explanation as to what functional units are present in each generation of processors.
Unified shaders : Texture mapping units : Render output units
簡單的說 就是你顯示卡裡面負責處理 畫面的 處理器的數量
數量越多 可處理的 3d 資料越大