Radeon HD 6790 vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which has a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 6790		150 Watts
	Difference: 25 Watts (20%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M395X should theoretically be a little bit better than the Radeon HD 6790 in general. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 25600 (19%)

Texel Rate

The Radeon R9 M395X is a lot (more or less 175%) more effective at texture filtering than the Radeon HD 6790. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 58944 (175%)

Pixel Rate

The Radeon R9 M395X is quite a bit (about 72%) more effective at anti-aliasing than the Radeon HD 6790, and able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 9696 (72%)

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 max amount of information (counted in MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.