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Radeon HD 5830 vs Radeon HD 6850

Intro

The Radeon HD 5830 makes use of a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM works at a frequency of 1000 MHz on this card. It features 1120(224x5) SPUs along with 56 Texture Address Units and 16 ROPs.

Compare all that to the Radeon HD 6850, which comes with clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs along with 48 Texture Address Units and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 5830 175 Watts
Difference: 48 Watts (38%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so theoretically they should have the same performance. (explain)

Texel Rate

The Radeon HD 5830 will be a bit (more or less 20%) more effective at anisotropic filtering than the Radeon HD 6850. (explain)

Radeon HD 5830 44800 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 7600 (20%)

Pixel Rate

The Radeon HD 6850 should be quite a bit (more or less 94%) better at FSAA than the Radeon HD 5830, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 5830 12800 Mpixels/sec
Difference: 12000 (94%)

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

Display Prices

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Radeon HD 5830

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

Display Specifications

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Model Radeon HD 5830 Radeon HD 6850
Manufacturer AMD AMD
Year February 25, 2010 October 2010
Code Name Cypress LE Barts Pro
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 800 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 1120(224x5) 960
Texture Mapping Units 56 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1
Power (Max TDP) 175 watts 127 watts
Shader Model 5.0 5.0
Bandwidth 128000 MB/sec 128000 MB/sec
Texel Rate 44800 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 24800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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