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Radeon HD 6850 vs Radeon HD 6870

Intro

The Radeon HD 6850 has core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs as well as 48 TAUs and 32 ROPs.

Compare those specifications to the Radeon HD 6870, which features a core clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

(No game benchmarks for this combination yet.)

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

Theoretically, the Radeon HD 6870 should be a little bit faster than the Radeon HD 6850 in general. (explain)

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

Texel Rate

The Radeon HD 6870 is quite a bit (more or less 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 a high resolution is important to you, then the Radeon HD 6870 is superior to the Radeon HD 6850, not by a very large margin though. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 6850

Amazon.com

Other US-based stores

Radeon HD 6870

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 6850 Radeon HD 6870
Manufacturer ATi ATi
Year October 2010 October 2010
Code Name Barts Pro Barts XT
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 775 MHz 900 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 960 1120
Texture Mapping Units 48 56
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 127 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 128000 MB/sec 134400 MB/sec
Texel Rate 37200 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of 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.

Comments

One Response to “Radeon HD 6850 vs Radeon HD 6870”
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