Geforce GTX 680 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which makes use of a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

Theoretically speaking, the Geforce GTX 680 should perform just a bit faster than the Radeon R9 M395X overall. (explain)

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

Texel Rate

The Geforce GTX 680 is quite a bit (about 39%) faster with regards to texture filtering than the Radeon R9 M395X. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Geforce GTX 680 is superior to the Radeon R9 M395X, by a large margin. (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: Bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.