Geforce GTX 770 vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which features clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Geforce GTX 770		230 Watts
	Difference: 105 Watts (84%)

Memory Bandwidth

Theoretically, the Geforce GTX 770 should perform quite a bit faster than the Radeon R9 M390X overall. (explain)

Geforce GTX 770		224384 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 64384 (40%)

Texel Rate

The Geforce GTX 770 is much (more or less 45%) better at texture filtering than the Radeon R9 M390X. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 41344 (45%)

Pixel Rate

The Geforce GTX 770 should be much (more or less 45%) faster with regards to AA than the Radeon R9 M390X, and also capable of handling higher resolutions more effectively. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 10336 (45%)

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 (counted in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.