Radeon HD 7950 3GB vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which features a clock speed of 725 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 7950 3GB should in theory be a lot superior to the Radeon R9 M270X overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 168000 (233%)

Texel Rate

The Radeon HD 7950 3GB will be a lot (more or less 209%) more effective at AF than the Radeon R9 M270X. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 60600 (209%)

Pixel Rate

The Radeon HD 7950 3GB will be a lot (about 121%) better at anti-aliasing than the Radeon R9 M270X, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 14000 (121%)

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 information (in units of megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.