Radeon HD 7870 vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which comes with core speeds of 750 MHz on the GPU, and 1375 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 7870		175 Watts
	Difference: 50 Watts (40%)

Memory Bandwidth

In theory, the Radeon R9 M295X is 15% quicker than the Radeon HD 7870 in general, because of its greater bandwidth. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 7870		153600 MB/sec
	Difference: 22400 (15%)

Texel Rate

The Radeon R9 M295X is just a bit (more or less 20%) more effective at AF than the Radeon HD 7870. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 7870		80000 Mtexels/sec
	Difference: 16000 (20%)

Pixel Rate

The Radeon HD 7870 is quite a bit (more or less 33%) better at anti-aliasing than the Radeon R9 M295X, and should be able to handle higher resolutions better. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 8000 (33%)

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 transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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