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Radeon HD 6750 vs Radeon HD 6850

Intro

The Radeon HD 6750 comes with clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. It features 720 SPUs as well as 36 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 6850, which features a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is made up of 960 SPUs, 48 Texture Address Units, and 32 ROPs.

Display Graphs

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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

The Radeon HD 6850 should theoretically be much faster than the Radeon HD 6750 in general. (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%) better at texture filtering than the Radeon HD 6750. (explain)

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

Pixel Rate

The Radeon HD 6850 is quite a bit (about 114%) more effective at anti-aliasing than the Radeon HD 6750, and also should be able to handle higher resolutions more effectively. (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

Amazon.com

Radeon HD 6850

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 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: Bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant 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.

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