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Radeon HD 6990 vs Radeon HD 7850

Intro

The Radeon HD 6990 has a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon HD 7850, which uses a 28 nm design. AMD has clocked the core frequency at 860 MHz. The GDDR5 RAM works at a frequency of 1200 MHz on this particular card. It features 1024 SPUs along with 64 Texture Address Units and 32 ROPs.

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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

As far as performance goes, the Radeon HD 6990 should in theory be quite a bit better than the Radeon HD 7850 overall. (explain)

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

Texel Rate

The Radeon HD 6990 is much (approximately 190%) faster with regards to anisotropic filtering 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 will be a lot (approximately 93%) better at FSAA than the Radeon HD 7850, and also able to handle higher screen resolutions while still performing well. (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

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Radeon HD 6990

Amazon.com

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Radeon HD 7850

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 6990 Radeon HD 7850
Manufacturer AMD AMD
Year March 2011 March 2012
Code Name Antilles Pitcairn Pro
Memory 2048 MB (x2) 2048 MB
Core Speed 830 MHz (x2) 860 MHz
Memory Speed 5000 MHz (x2) 4800 MHz
Power (Max TDP) 375 watts 130 watts
Bandwidth 320000 MB/sec 153600 MB/sec
Texel Rate 159360 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 1536 (x2) 1024
Texture Mapping Units 96 (x2) 64
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 2800 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 number of texture map elements (texels) that can be processed per second. This figure 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core 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 rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon HD 7850

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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