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Radeon HD 5830 vs Radeon HD 6850


Intro

The Radeon HD 5830 features a GPU core clock speed of 800 MHz, and the 1024 MB of GDDR5 RAM runs at 1000 MHz through a 256-bit bus. It also is comprised of 1120(224x5) SPUs, 56 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6850, which features a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also is comprised of 960 SPUs, 48 Texture Address Units, 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 memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 5830 is a little bit (more or less 20%) faster with regards to AF 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 will be quite a bit (approximately 94%) faster with regards to FSAA than the Radeon HD 5830, and able to handle higher screen resolutions without slowing down too much. (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 largest amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, 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 is calculated by multiplying the total texture units 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Radeon HD 5830

Radeon HD 6850

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