GeForce GTX 660 vs Radeon R9 M295X

Intro

Compare those specs to the Radeon R9 M295X, which features clock speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
GeForce GTX 660		140 Watts
	Difference: 15 Watts (12%)

Memory Bandwidth

In theory, the Radeon R9 M295X should perform quite a bit faster than the GeForce GTX 660 in general. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 31808 (22%)

Texel Rate

The Radeon R9 M295X is quite a bit (more or less 22%) faster with regards to texture filtering than the GeForce GTX 660. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 17600 (22%)

Pixel Rate

The Radeon R9 M295X is a bit (about 2%) faster with regards to anti-aliasing than the GeForce GTX 660, and should be able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 480 (2%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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