Geforce GTX 680 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this particular model. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Geforce GTX 680		195 Watts
	Difference: 70 Watts (56%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should theoretically be a bit better than the Radeon R9 M390X in general. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 32256 (20%)

Texel Rate

The Geforce GTX 680 is a lot (about 39%) more effective at texture filtering than the Radeon R9 M390X. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 36224 (39%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 680 is the winner, and very much so. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R9 M390X		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 largest amount of data (counted in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.