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Radeon HD 6750 vs Radeon HD 6850

Intro

The Radeon HD 6750 has a core clock speed of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It features 720 SPUs, 36 TAUs, and 16 ROPs.

Compare all of that 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 particular model. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

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

Theoretically speaking, the Radeon HD 6850 should be 100% quicker than the Radeon HD 6750 overall, due to its higher data rate. (explain)

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

Texel Rate

The Radeon HD 6850 is much (more or less 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 a better choice, 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

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 maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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