Nvidia Titan X vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which uses a 28 nm design. AMD has set the core frequency at 723 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this specific card. It features 2048 SPUs along with 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

Performance-wise, the Nvidia Titan X should theoretically be a lot superior to the Radeon R9 M390X overall. (explain)

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

Texel Rate

The Nvidia Titan X will be much (more or less 243%) more effective at AF 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 is quite a bit (approximately 488%) more effective at full screen anti-aliasing than the Radeon R9 M390X, and also will be able to handle 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 largest amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the 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 video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.