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Radeon HD 6750 vs Radeon HD 6850

Intro

The Radeon HD 6750 uses a 40 nm design. AMD has set the core frequency at 725 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this specific model. It features 720 SPUs as well as 36 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6850, which features a clock frequency of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is made up of 960 SPUs, 48 TAUs, and 32 Raster Operation Units.

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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

Performance-wise, the Radeon HD 6850 should in theory be much better 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 a lot (approximately 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 running with a high resolution is important to you, then the Radeon HD 6850 is a better choice, and very much so. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, 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 AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

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