Radeon HD 7970 vs Radeon R9 M265X

Intro

Compare all that to the Radeon R9 M265X, which has core clock speeds of 575 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 7970 should in theory be a lot superior to 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 will be a lot (more or less 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 is quite a bit (approximately 222%) more effective at anti-aliasing than the Radeon R9 M265X, and will be able to handle higher screen resolutions while still performing well. (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 (measured in megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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