Radeon HD 7970 vs Radeon R9 M265X

Intro

Compare those specifications to the Radeon R9 M265X, which has a core clock speed of 575 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 7970 should theoretically perform much faster than the Radeon R9 M265X in general. (explain)

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

Texel Rate

The Radeon HD 7970 is much (more or less 415%) faster with regards to AF 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 should be much (approximately 222%) faster with regards to full screen anti-aliasing than the Radeon R9 M265X, and also should be able to handle higher resolutions without slowing down too much. (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 largest amount of data (measured in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics 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 most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. 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 output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.