Nvidia Titan X vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which features a clock speed of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit memory bus, and makes use of a 28 nm design. It features 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Nvidia Titan X should be much faster than the Radeon R9 390 8G overall. (explain)

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

Texel Rate

The Nvidia Titan X should be a lot (about 98%) better at texture filtering than the Radeon R9 390 8G. (explain)

Nvidia Titan X		317408 Mtexels/sec
Radeon R9 390 8G		160000 Mtexels/sec
	Difference: 157408 (98%)

Pixel Rate

The Nvidia Titan X is much (more or less 113%) better at FSAA than the Radeon R9 390 8G, and also will be capable of handling higher screen resolutions better. (explain)

Nvidia Titan X		136032 Mpixels/sec
Radeon R9 390 8G		64000 Mpixels/sec
	Difference: 72032 (113%)

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 maximum amount of information (in units of MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.