GeForce GTX 660 is a fast-middle-class to low-high-end GFX part of the GeForce 600 Series released by NVIDIA.
It's based on the Kepler GK106 Core with only 960 Shader Processing Units. Its central clock is clocked at 980MHz and goes up to 1032MHz on Turbo Mode. The memory clock, just like the Kepler GK104 based GPUs, is of 1502MHz (operating). Fast GDDR5 was obviously used and paired with a 192-bit bus.
Benchmarks indicate its performance is around 17% worse than GTX 660 Ti but still on level with previous generation and acclaimed GeForce GTX 570.
This GPU needs to be equipped with a relatively strong Quad Core CPU, such as 3570K or equivalent and upgrading this GPU to anything weaker than a dual-graphics solution, such as GeForce GTX 690, is worthless.
Source [Pip]
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