GeForce GTX Titan X vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which has core 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 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce GTX Titan X		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

The GeForce GTX Titan X, in theory, should perform much faster than the Radeon R9 M390X overall. (explain)

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

Texel Rate

The GeForce GTX Titan X should be quite a bit (more or less 107%) more effective at texture filtering than the Radeon R9 M390X. (explain)

GeForce GTX Titan X		192000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 99456 (107%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX Titan X is the winner, and very much so. (explain)

GeForce GTX Titan X		96000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 72864 (315%)

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 information (measured in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends 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 max fill rate.