Geforce GTX 690 vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which comes with clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs as well as 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 M390X		125 Watts
Geforce GTX 690		300 Watts
	Difference: 175 Watts (140%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 690 is 140% quicker than the Radeon R9 M390X in general, due to its higher data rate. (explain)

Geforce GTX 690		384512 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 224512 (140%)

Texel Rate

The Geforce GTX 690 will be a lot (more or less 153%) better at texture filtering than the Radeon R9 M390X. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 141696 (153%)

Pixel Rate

The Geforce GTX 690 will be a lot (approximately 153%) better at AA than the Radeon R9 M390X, and also should be capable of handling higher resolutions more effectively. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 35424 (153%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. The number is 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 ANOTHER 2x. The higher the card's 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 number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock 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 rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.