Even the older high-end Fermi-GPU GTX 570M is only slightly faster. Thanks to the GDDR5-VRAM, the gaming performance of the GeForce GTX 660M is well ahead of the GT 650M DDR3 and on par with the AMD Radeon HD 6950M. The implementation of this boost mode is done in the BIOS, but it is ultimately dependent upon the manufacturer of the laptop. PCIe 3.0 is now supported by the mobile Kepler series and an optional Turbo mode can automatically overclock the Nvidia card by a theoretical 15 percent if the laptop cooling system allows it. However, due to the missing hot clock of the shader domain, two shaders of a Kepler chip are of similar speed to one shader of a Fermi chip (as the latter was clocked twice as fast). 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 as the central 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 GDDR5-VRAM. As of this writing, it is the fastest Kepler-based GPU built on the GK107 architecture and is manufactured in 28nm at TSMC. The NVIDIA GeForce GTX 660M is an upper mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for laptops. NVIDIA GeForce GTX 660M ► remove from comparison
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