Geforce GTX 670 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has a core clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Geforce GTX 670		170 Watts
	Difference: 45 Watts (36%)

Memory Bandwidth

In theory, the Geforce GTX 670 should be a bit faster than the Radeon R9 M390X in general. (explain)

Geforce GTX 670		192000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 32000 (20%)

Texel Rate

The Geforce GTX 670 will be just a bit (approximately 11%) better at texture filtering than the Radeon R9 M390X. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 9936 (11%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 670 is the winner, by a large margin. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 6144 (27%)

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 data (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.