Radeon HD 6790 vs Radeon R9 M295X

Intro

Compare that to the Radeon R9 M295X, which has a core clock speed of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 6790		150 Watts
	Difference: 25 Watts (20%)

Memory Bandwidth

The Radeon R9 M295X should theoretically be a lot faster than the Radeon HD 6790 overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 41600 (31%)

Texel Rate

The Radeon R9 M295X is much (about 186%) better at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 62400 (186%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 M295X is the winner, by a large margin. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 10560 (79%)

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 (counted in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 can be applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.