Radeon HD 6990 vs Radeon R9 M375X

Intro

Compare those specs to the Radeon R9 M375X, which comes with a core clock frequency of 1015 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 made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6990 should in theory perform a lot 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 (about 293%) more effective at texture filtering 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 screen resolution is important to you, then the Radeon HD 6990 is superior to the Radeon R9 M375X, by far. (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 largest amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.