Geforce GTX 680 vs Radeon R9 M395X

Intro

Compare all of that to the Radeon R9 M395X, which features clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Geforce GTX 680		195 Watts
	Difference: 70 Watts (56%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should in theory be just a bit better than the Radeon R9 M395X in general. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R9 M395X		160000 MB/sec
	Difference: 32256 (20%)

Texel Rate

The Geforce GTX 680 will be a lot (approximately 39%) better at anisotropic filtering than the Radeon R9 M395X. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R9 M395X		92544 Mtexels/sec
	Difference: 36224 (39%)

Pixel Rate

The Geforce GTX 680 will be quite a bit (approximately 39%) more effective at full screen anti-aliasing than the Radeon R9 M395X, and also should be able to handle higher screen resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R9 M395X		23136 Mpixels/sec
	Difference: 9056 (39%)

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 (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines 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 output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.