Radeon HD 6990 vs Radeon R9 M375

Intro

Compare those specs to the Radeon R9 M375, which has GPU clock speed of 1015 MHz, and 4096 MB of DDR3 RAM set to run at 1100 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6990, in theory, should be a lot faster than the Radeon R9 M375 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 M375		35200 MB/sec
	Difference: 284800 (809%)

Texel Rate

The Radeon HD 6990 will be much (approximately 293%) more effective at texture filtering than the Radeon R9 M375. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 M375		40600 Mtexels/sec
	Difference: 118760 (293%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6990 is superior to the Radeon R9 M375, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 M375		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: Memory bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.