Radeon HD 7970 vs Radeon R9 M265X

Intro

Compare that to the Radeon R9 M265X, which has 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

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 will be 267% quicker than the Radeon R9 M265X overall, because of its greater data rate. (explain)

Radeon HD 7970		264000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 192000 (267%)

Texel Rate

The Radeon HD 7970 will be much (about 415%) more effective at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 95400 (415%)

Pixel Rate

The Radeon HD 7970 will be quite a bit (about 222%) faster with regards to anti-aliasing than the Radeon R9 M265X, and also will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 20400 (222%)

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 (counted in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 figure is calculated by multiplying the total number 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 that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.