Radeon HD 6990 vs Radeon R9 M375X

Intro

Compare those specifications to the Radeon R9 M375X, which uses a 28 nm design. AMD has clocked the core speed at 1015 MHz. The GDDR5 memory runs at a frequency of 1125 MHz on this particular model. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6990 should theoretically perform quite a bit faster than the Radeon R9 M375X overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 M375X		72000 MB/sec
	Difference: 248000 (344%)

Texel Rate

The Radeon HD 6990 is a lot (more or less 293%) better at AF than the Radeon R9 M375X. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 M375X		40600 Mtexels/sec
	Difference: 118760 (293%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6990 is superior to the Radeon R9 M375X, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 M375X		16240 Mpixels/sec
	Difference: 36880 (227%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the 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 amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out 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 output rate is also dependant on lots of 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.