Radeon HD 6990 vs Radeon R9 M385X

Intro

Compare those specifications to the Radeon R9 M385X, which has core speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 memory. It features 896 SPUs along with 56 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 M385X in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 224000 (233%)

Texel Rate

The Radeon HD 6990 will be a lot (approximately 159%) better at anisotropic filtering than the Radeon R9 M385X. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 M385X		61600 Mtexels/sec
	Difference: 97760 (159%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6990 is superior to the Radeon R9 M385X, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 M385X		17600 Mpixels/sec
	Difference: 35520 (202%)

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 largest amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one 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 - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.