GeForce GTX 980 vs Radeon R9 M265X

Intro

Compare all that to the Radeon R9 M265X, which comes with GPU clock speed of 575 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce GTX 980, in theory, should be much faster than the Radeon R9 M265X overall. (explain)

GeForce GTX 980		224000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 152000 (211%)

Texel Rate

The GeForce GTX 980 is a lot (approximately 527%) faster with regards to texture filtering than the Radeon R9 M265X. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 121128 (527%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 980 is the winner, and very much so. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 62864 (683%)

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 information (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 are applied per second. This number is calculated by multiplying the total number of 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.