GeForce GTX 660 vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which comes with a core clock speed of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

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

Theoretically speaking, the Radeon R9 M295X is 22% faster than the GeForce GTX 660 overall, because of its greater data rate. (explain)

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

Texel Rate

The Radeon R9 M295X is much (more or less 22%) better at AF 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 little bit (approximately 2%) more effective at anti-aliasing than the GeForce GTX 660, and should be capable of handling higher screen resolutions more effectively. (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 maximum amount of information (in units of MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.