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GeForce GTX 660 vs Radeon R5 M255

Intro

The GeForce GTX 660 uses a 28 nm design. nVidia has clocked the core frequency at 980 MHz. The GDDR5 RAM is set to run at a frequency of 1502 MHz on this particular model. It features 960 SPUs as well as 80 Texture Address Units and 24 ROPs.

Compare those specifications to the Radeon R5 M255, which uses a 28 nm design. AMD has clocked the core speed at 940 MHz. The DDR3 RAM works at a speed of 1000 MHz on this model. It features 320 SPUs as well as 20 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GTX 660 should perform much faster than the Radeon R5 M255 overall. (explain)

GeForce GTX 660 144192 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 128192 (801%)

Texel Rate

The GeForce GTX 660 should be much (about 317%) faster with regards to AF than the Radeon R5 M255. (explain)

GeForce GTX 660 78400 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 59600 (317%)

Pixel Rate

The GeForce GTX 660 will be much (about 213%) faster with regards to full screen anti-aliasing than the Radeon R5 M255, and also will be able to handle higher resolutions better. (explain)

GeForce GTX 660 23520 Mpixels/sec
Radeon R5 M255 7520 Mpixels/sec
Difference: 16000 (213%)

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 660

Amazon.com

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Radeon R5 M255

Amazon.com

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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 660 Radeon R5 M255
Manufacturer nVidia AMD
Year September 2012 June 2014
Code Name GK106 Jet Pro
Memory 2048 MB 2048 MB
Core Speed 980 MHz 940 MHz
Memory Speed 6008 MHz 2000 MHz
Power (Max TDP) 140 watts (Unknown) watts
Bandwidth 144192 MB/sec 16000 MB/sec
Texel Rate 78400 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 23520 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 960 320
Texture Mapping Units 80 20
Render Output Units 24 8
Bus Type GDDR5 DDR3
Bus Width 192-bit 64-bit
Fab Process 28 nm 28 nm
Transistors 2540 million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x8
DirectX Version DirectX 11.0 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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

Display Prices

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GeForce GTX 660

Amazon.com

Check prices at:

Radeon R5 M255

Amazon.com

Check prices at:

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.

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