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Radeon HD 6750 vs Radeon HD 6850


The Radeon HD 6750 comes with a clock frequency of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 720 SPUs, 36 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6850, which uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM is set to run at a frequency of 1000 MHz on this model. It features 960 SPUs as well as 48 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 86 Watts
Radeon HD 6850 127 Watts
Difference: 41 Watts (48%)

Memory Bandwidth

In theory, the Radeon HD 6850 will be 100% faster than the Radeon HD 6750 in general, because of its greater data rate. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 6750 64000 MB/sec
Difference: 64000 (100%)

Texel Rate

The Radeon HD 6850 should be quite a bit (about 43%) more effective at anisotropic filtering than the Radeon HD 6750. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 6750 26100 Mtexels/sec
Difference: 11100 (43%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6850 is the winner, by far. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 13200 (114%)

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 6750

Radeon HD 6850

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.


Display Specifications

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Model Radeon HD 6750 Radeon HD 6850
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper Pro Barts Pro
Memory 512 MB 1024 MB
Core Speed 725 MHz 775 MHz
Memory Speed 4000 MHz 4000 MHz
Power (Max TDP) 86 watts 127 watts
Bandwidth 64000 MB/sec 128000 MB/sec
Texel Rate 26100 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 720 960
Texture Mapping Units 36 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card 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 applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.


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