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Radeon HD 6850 vs Radeon HD 6870

Intro

The Radeon HD 6850 comes with core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 6870, which has a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1120 SPUs, 56 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 6870 151 Watts
Difference: 24 Watts (19%)

Memory Bandwidth

In theory, the Radeon HD 6870 should be 5% faster than the Radeon HD 6850 in general, because of its greater bandwidth. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 6400 (5%)

Texel Rate

The Radeon HD 6870 should be much (approximately 35%) more effective at texture filtering than the Radeon HD 6850. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 13200 (35%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6870 is superior to the Radeon HD 6850, but it probably won't make a huge difference. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 6850 24800 Mpixels/sec
Difference: 4000 (16%)

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

Radeon HD 6870

Amazon.com

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 HD 6870
Manufacturer AMD AMD
Year October 2010 October 2010
Code Name Barts Pro Barts XT
Memory 1024 MB 1024 MB
Core Speed 775 MHz 900 MHz
Memory Speed 4000 MHz 4200 MHz
Power (Max TDP) 127 watts 151 watts
Bandwidth 128000 MB/sec 134400 MB/sec
Texel Rate 37200 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 960 1120
Texture Mapping Units 48 56
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1700 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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

Comments

One Response to “Radeon HD 6850 vs Radeon HD 6870”
PC multiuso - no budget - Forum di Tom's Hardware says:

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