Radeon HD 6990 vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which comes with GPU core speed of 860 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also features 1024 Stream Processors, 64 Texture Address Units, and 32 Raster Operation Units.

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 HD 6990		5820 points
Radeon HD 7850		5200 points
	Difference: 620 (12%)

Ethereum Mining Hash Rate

Radeon HD 6990		24 Mh/s
Radeon HD 7850		13 Mh/s
	Difference: 11 (85%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850		130 Watts
Radeon HD 6990		375 Watts
	Difference: 245 Watts (188%)

Memory Bandwidth

The Radeon HD 6990, in theory, should perform a lot faster than the Radeon HD 7850 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 166400 (108%)

Texel Rate

The Radeon HD 6990 will be quite a bit (more or less 190%) more effective at AF than the Radeon HD 7850. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 104320 (190%)

Pixel Rate

The Radeon HD 6990 is quite a bit (approximately 93%) better at full screen anti-aliasing than the Radeon HD 7850, and will be capable of handling higher resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 7850		27520 Mpixels/sec
	Difference: 25600 (93%)

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 (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.