GeForce GTX Titan Black vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this particular card. It features 2048 SPUs as well as 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 Titan Black		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

As far as performance goes, the GeForce GTX Titan Black should theoretically be quite a bit better than the Radeon R9 M390X in general. (explain)

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

Texel Rate

The GeForce GTX Titan Black should be quite a bit (about 131%) faster with regards to anisotropic filtering than the Radeon R9 M390X. (explain)

GeForce GTX Titan Black		213360 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 120816 (131%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX Titan Black is a better choice, by a large margin. (explain)

GeForce GTX Titan Black		42672 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 19536 (84%)

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 largest amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 can be processed in one second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends 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.