Radeon HD 6990 vs Radeon R9 M375

Intro

Compare those specifications to the Radeon R9 M375, which comes with a clock speed of 1015 MHz and a DDR3 memory frequency of 1100 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be quite a bit faster than the Radeon R9 M375 overall. (explain)

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

Texel Rate

The Radeon HD 6990 will be quite a bit (approximately 293%) more effective at AF than the Radeon R9 M375. (explain)

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

Pixel Rate

The Radeon HD 6990 will be quite a bit (approximately 227%) better at AA than the Radeon R9 M375, and capable of handling higher screen resolutions better. (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: Bandwidth is the max amount of information (counted in MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.