GeForce GTX 980 Ti vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core frequency at 723 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this specific 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 980 Ti		250 Watts
	Difference: 125 Watts (100%)

Memory Bandwidth

The GeForce GTX 980 Ti should in theory be a lot faster than the Radeon R9 M390X overall. (explain)

GeForce GTX 980 Ti		336000 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 176000 (110%)

Texel Rate

The GeForce GTX 980 Ti is a lot (approximately 90%) faster with regards to texture filtering than the Radeon R9 M390X. (explain)

GeForce GTX 980 Ti		176000 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 83456 (90%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 980 Ti is superior to the Radeon R9 M390X, by a large margin. (explain)

GeForce GTX 980 Ti		96000 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 72864 (315%)

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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one 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. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.