Although more shader cores are available in the Kepler architecture as compared to the Fermi design, the Kepler shaders are still expected to be up to twice as power efficient. 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 500M series. Watch out: Following rumors, there will also be a Fermi-based version (96 shaders, 762 MHz, DDR3/GDDR5, similar to 550M/ 555M) with a probably higher power consumption than the Kepler variant. A slower core clock of only 500 MHz differs the LE-model from a normal GT 640M. The graphics card uses a 128-Bit wide memory interface with DDR3-VRAM. It is a Kepler-based GPU built on the GK107 architecture and is manufactured in 28nm at TSMC. The NVIDIA GeForce GT 640M LE is a mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for thin-and-light-laptops. NVIDIA GeForce GT 640M LE ► remove from comparison
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