GeForce GTX Titan vs Radeon R9 M390X

Intro

Compare that to the Radeon R9 M390X, which uses a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this card. 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		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

The GeForce GTX Titan, in theory, should be quite a bit faster than the Radeon R9 M390X in general. (explain)

GeForce GTX Titan		288384 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 128384 (80%)

Texel Rate

The GeForce GTX Titan should be much (about 103%) better at AF than the Radeon R9 M390X. (explain)

GeForce GTX Titan		187488 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 94944 (103%)

Pixel Rate

The GeForce GTX Titan will be quite a bit (approximately 74%) better at full screen anti-aliasing than the Radeon R9 M390X, and will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX Titan		40176 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 17040 (74%)

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 max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, 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 calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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