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GeForce GTX 460 vs GeForce GTX 660

Intro

The GeForce GTX 460 has core clock speeds of 675 MHz on the GPU, and 900 MHz on the 768 MB of GDDR5 memory. It features 336 SPUs along with 56 TAUs and 24 ROPs.

Compare all that to the GeForce GTX 660, which comes with a clock speed of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also makes use of a 192-bit memory bus, and makes use of a 28 nm design. It is made up of 960 SPUs, 80 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 140 Watts
GeForce GTX 460 150 Watts
Difference: 10 Watts (7%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 should theoretically be a lot superior to the GeForce GTX 460 overall. (explain)

GeForce GTX 660 144192 MB/sec
GeForce GTX 460 86400 MB/sec
Difference: 57792 (67%)

Texel Rate

The GeForce GTX 660 should be a lot (more or less 107%) faster with regards to anisotropic filtering than the GeForce GTX 460. (explain)

GeForce GTX 660 78400 Mtexels/sec
GeForce GTX 460 37800 Mtexels/sec
Difference: 40600 (107%)

Pixel Rate

The GeForce GTX 660 will be quite a bit (approximately 45%) better at AA than the GeForce GTX 460, and also capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 660 23520 Mpixels/sec
GeForce GTX 460 16200 Mpixels/sec
Difference: 7320 (45%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce GTX 460

Amazon.com

GeForce GTX 660

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 460 GeForce GTX 660
Manufacturer nVidia nVidia
Year July 2010 September 2012
Code Name GF104 GK106
Memory 768 MB 2048 MB
Core Speed 675 MHz 980 MHz
Memory Speed 3600 MHz 6008 MHz
Power (Max TDP) 150 watts 140 watts
Bandwidth 86400 MB/sec 144192 MB/sec
Texel Rate 37800 Mtexels/sec 78400 Mtexels/sec
Pixel Rate 16200 Mpixels/sec 23520 Mpixels/sec
Unified Shaders 336 960
Texture Mapping Units 56 80
Render Output Units 24 24
Bus Type GDDR5 GDDR5
Bus Width 192-bit 192-bit
Fab Process 40 nm 28 nm
Transistors 1950 million 2540 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.0
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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