GeForce GTX 590 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which features core speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 TAUs 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 590		365 Watts
	Difference: 240 Watts (192%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 590 should perform quite a bit faster than the Radeon R9 M390X overall. (explain)

GeForce GTX 590		328320 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 168320 (105%)

Texel Rate

The Radeon R9 M390X will be a little bit (about 19%) faster with regards to texture filtering than the GeForce GTX 590. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTX 590		77696 Mtexels/sec
	Difference: 14848 (19%)

Pixel Rate

The GeForce GTX 590 should be quite a bit (about 152%) more effective at full screen anti-aliasing than the Radeon R9 M390X, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 590		58272 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 35136 (152%)

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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, 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 by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.