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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 clocked the core speed at 800 MHz. The GDDR5 RAM runs at a frequency of 1000 MHz on this particular card. It features 1120(224x5) SPUs along with 56 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 6850, which comes with a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also is comprised of 960 SPUs, 48 TAUs, and 32 ROPs.

Display Graphs

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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 the exact same bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 5830 will be a small bit (about 20%) better at AF than the Radeon HD 6850. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6850 is a better choice, by far. (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

Radeon HD 5830

Radeon HD 6850

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
Memory 1024 MB 1024 MB
Core Speed 800 MHz 775 MHz
Memory Speed 4000 MHz 4000 MHz
Power (Max TDP) 175 watts 127 watts
Bandwidth 128000 MB/sec 128000 MB/sec
Texel Rate 44800 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 12800 Mpixels/sec 24800 Mpixels/sec
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
Fab Process 40 nm 40 nm
Transistors 2154 million 1700 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 per second. This number is calculated by multiplying the total number of texture units of the card 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 in one second.

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

Radeon HD 5830

Radeon HD 6850

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