Nvidia Titan X vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 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
Nvidia Titan X		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Nvidia Titan X will be 207% faster than the Radeon R9 M390X in general, due to its higher bandwidth. (explain)

Nvidia Titan X		491520 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 331520 (207%)

Texel Rate

The Nvidia Titan X will be a lot (approximately 243%) more effective at anisotropic filtering than the Radeon R9 M390X. (explain)

Nvidia Titan X		317408 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 224864 (243%)

Pixel Rate

The Nvidia Titan X will be quite a bit (about 488%) better at AA than the Radeon R9 M390X, and should be capable of handling higher resolutions while still performing well. (explain)

Nvidia Titan X		136032 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 112896 (488%)

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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.