GeForce GTX 780 Ti vs Radeon R9 M390X

Intro

Compare all that 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 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 780 Ti		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

The GeForce GTX 780 Ti should theoretically perform quite a bit faster than the Radeon R9 M390X in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 176000 (110%)

Texel Rate

The GeForce GTX 780 Ti will be a lot (approximately 127%) better at AF than the Radeon R9 M390X. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 117456 (127%)

Pixel Rate

The GeForce GTX 780 Ti should be much (more or less 82%) faster with regards to anti-aliasing than the Radeon R9 M390X, and will be capable of handling higher screen resolutions better. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 18864 (82%)

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 information (in units of MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure 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 drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.