Radeon HD 6990 vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which uses a 28 nm design. AMD has clocked the core speed at 918 MHz. The GDDR5 RAM runs at a frequency of 1375 MHz on this specific model. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 285		8500 points
Radeon HD 6990		5820 points
	Difference: 2680 (46%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon R9 285		18 Mh/s
	Difference: 6 (33%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
Radeon HD 6990		375 Watts
	Difference: 185 Watts (97%)

Memory Bandwidth

The Radeon HD 6990 should theoretically be quite a bit faster than the Radeon R9 285 overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 144000 (82%)

Texel Rate

The Radeon HD 6990 should be quite a bit (more or less 55%) better at AF than the Radeon R9 285. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 56544 (55%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is the winner, by far. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 23744 (81%)

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 data (counted in MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.