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Radeon HD 6750 vs Radeon HD 6850

Intro

The Radeon HD 6750 features a GPU clock speed of 725 MHz, and the 512 MB of GDDR5 memory runs at 1000 MHz through a 128-bit bus. It also features 720 SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6850, which uses a 40 nm design. AMD has set the core speed at 775 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this particular model. It features 960 SPUs as well as 48 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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 will be 100% faster 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 should be quite a bit (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 lots of anti-aliasing is important to you, then the Radeon HD 6850 is superior to the Radeon HD 6750, by a large margin. (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

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

Model Radeon HD 6750 Radeon HD 6850
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper Pro Barts Pro
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe x16
Memory 512 MB 1024 MB
Core Speed 725 MHz 775 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 720 960
Texture Mapping Units 36 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.0 OpenGL 4.1
Power (Max TDP) 86 watts 127 watts
Shader Model 5.0 5.0
Bandwidth 64000 MB/sec 128000 MB/sec
Texel Rate 26100 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 11600 Mpixels/sec 24800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 is calculated by multiplying the total number of texture units by the core speed of the chip. The better 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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