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Radeon HD 5850 vs Radeon HD 6850

Intro

The Radeon HD 5850 comes with a core clock speed of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1440(288x5) SPUs, 72 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon HD 6850, which comes with a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 960 SPUs, 48 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 5850 151 Watts
Difference: 24 Watts (19%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 5850 will be a lot (approximately 40%) faster with regards to anisotropic filtering than the Radeon HD 6850. (explain)

Radeon HD 5850 52200 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 15000 (40%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6850 is superior to the Radeon HD 5850, but only just. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 5850 23200 Mpixels/sec
Difference: 1600 (7%)

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.

Price Comparison

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Radeon HD 5850

Amazon.com

Check prices at:

Radeon HD 6850

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.

Specifications

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Model Radeon HD 5850 Radeon HD 6850
Manufacturer AMD AMD
Year September 30, 2009 October 2010
Code Name Cypress PRO Barts Pro
Memory 1024 MB 1024 MB
Core Speed 725 MHz 775 MHz
Memory Speed 4000 MHz 4000 MHz
Power (Max TDP) 151 watts 127 watts
Bandwidth 128000 MB/sec 128000 MB/sec
Texel Rate 52200 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 23200 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 1440(288x5) 960
Texture Mapping Units 72 48
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 2154 million 1700 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics 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 most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 5850

Amazon.com

Check prices at:

Radeon HD 6850

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.

Comments

6 Responses to “Radeon HD 5850 vs Radeon HD 6850”
xd says:

i am the best

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Bem says:

Buy CF 5850 three years ago, and so is the best 🙂

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