Nvidia Titan X vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which has a core clock speed of 1050 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit bus, and makes use of a 28 nm design. It is made up of 2816 SPUs, 176 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Nvidia Titan X		250 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 25 Watts (10%)

Memory Bandwidth

Theoretically, the Nvidia Titan X should perform a lot faster than the Radeon R9 390X 8G in general. (explain)

Nvidia Titan X		491520 MB/sec
Radeon R9 390X 8G		384000 MB/sec
	Difference: 107520 (28%)

Texel Rate

The Nvidia Titan X is much (approximately 72%) faster with regards to anisotropic filtering than the Radeon R9 390X 8G. (explain)

Nvidia Titan X		317408 Mtexels/sec
Radeon R9 390X 8G		184800 Mtexels/sec
	Difference: 132608 (72%)

Pixel Rate

If using high levels of AA is important to you, then the Nvidia Titan X is the winner, by a large margin. (explain)

Nvidia Titan X		136032 Mpixels/sec
Radeon R9 390X 8G		67200 Mpixels/sec
	Difference: 68832 (102%)

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 across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the 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 amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs 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 output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.