Radeon HD 6990 vs Radeon R9 M370X

Intro

Compare those specs to the Radeon R9 M370X, which has a GPU core clock speed of 800 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised 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, in theory, should perform a lot faster than the Radeon R9 M370X overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 M370X		72000 MB/sec
	Difference: 248000 (344%)

Texel Rate

The Radeon HD 6990 will be much (approximately 398%) more effective at texture filtering than the Radeon R9 M370X. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 M370X		32000 Mtexels/sec
	Difference: 127360 (398%)

Pixel Rate

The Radeon HD 6990 will be a lot (about 315%) better at full screen anti-aliasing than the Radeon R9 M370X, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 M370X		12800 Mpixels/sec
	Difference: 40320 (315%)

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

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.