GeForce GTX 660 vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which comes with core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
GeForce GTX 660		140 Watts
	Difference: 15 Watts (12%)

Memory Bandwidth

The Radeon R9 M395X should theoretically perform a bit faster than the GeForce GTX 660 in general. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 15808 (11%)

Texel Rate

The Radeon R9 M395X will be a bit (about 18%) better at AF than the GeForce GTX 660. (explain)

Radeon R9 M395X		92544 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 14144 (18%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 660 is the winner, though not by far. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 384 (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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 ability to get to the max fill rate.