The GK107 Kepler core offers two shader blocks, called SMX, each with 192 shaders for a total of 384 shader cores that are clocked at the same speed as the processor core. The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. The graphics card uses a 128-Bit wide memory interface with either the more common but slower DDR3 for VRAM or the more expensive and faster GDDR5. It is a Kepler-based GPU built on the GK107 architecture and is manufactured in 28nm at TSMC. The NVIDIA GeForce GT 640M is a mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for laptops.
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