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Radeon HD 6850 vs Radeon HD 6870


Intro

The Radeon HD 6850 comes with a GPU clock speed of 775 MHz, and the 1024 MB of GDDR5 memory is set to run at 1000 MHz through a 256-bit bus. It also is comprised of 960 Stream Processors, 48 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 6870, which features a GPU core clock speed of 900 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 256-bit bus. It also is made up of 1120 Stream Processors, 56 TAUs, and 32 Raster Operation Units.

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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 6870 2870 points
Radeon HD 6850 2395 points
Difference: 475 (20%)

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 just a 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 should be much (about 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

The Radeon HD 6870 will be just a bit (more or less 16%) better at full screen anti-aliasing than the Radeon HD 6850, and will be able to handle higher screen resolutions while still performing well. (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

Radeon HD 6850

Radeon HD 6870

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 largest amount of information (in units of megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher 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 maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Radeon HD 6850

Radeon HD 6870

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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