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Radeon HD 6850 vs Radeon RX 580

Intro

The Radeon HD 6850 has a clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It features 960 SPUs, 48 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon RX 580, which has a GPU core clock speed of 1257 MHz, and 8192 MB of GDDR5 memory running at 2000 MHz through a 256-bit bus. It also features 2304 Stream Processors, 144 TAUs, 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 RX 580 13630 points
Radeon HD 6850 2395 points
Difference: 11235 (469%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon RX 580 185 Watts
Difference: 58 Watts (46%)

Memory Bandwidth

Performance-wise, the Radeon RX 580 should in theory be quite a bit better than the Radeon HD 6850 overall. (explain)

Radeon RX 580 262144 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 134144 (105%)

Texel Rate

The Radeon RX 580 should be much (approximately 387%) more effective at anisotropic filtering than the Radeon HD 6850. (explain)

Radeon RX 580 181008 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 143808 (387%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon RX 580 is a better choice, by far. (explain)

Radeon RX 580 40224 Mpixels/sec
Radeon HD 6850 24800 Mpixels/sec
Difference: 15424 (62%)

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 6850

Amazon.com

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Radeon RX 580

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 6850 Radeon RX 580
Manufacturer AMD AMD
Year October 2010 April 2017
Code Name Barts Pro Polaris 20
Memory 1024 MB 8192 MB
Core Speed 775 MHz 1257 MHz
Memory Speed 4000 MHz 8000 MHz
Power (Max TDP) 127 watts 185 watts
Bandwidth 128000 MB/sec 262144 MB/sec
Texel Rate 37200 Mtexels/sec 181008 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 40224 Mpixels/sec
Unified Shaders 960 2304
Texture Mapping Units 48 144
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 14 nm
Transistors 1700 million 5700 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 amount of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - 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 6850

Amazon.com

Check prices at:

Radeon RX 580

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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