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Radeon HD 4850 2GB vs Radeon HD 6850

Intro

The Radeon HD 4850 2GB makes use of a 55 nm design. AMD has set the core speed at 625 MHz. The GDDR4 memory runs at a speed of 993 MHz on this specific card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 6850, which makes use of a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM works at a frequency of 1000 MHz on this model. It features 960 SPUs along with 48 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB 110 Watts
Radeon HD 6850 127 Watts
Difference: 17 Watts (15%)

Memory Bandwidth

Performance-wise, the Radeon HD 6850 should theoretically be a lot better than the Radeon HD 4850 2GB in general. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 64448 (101%)

Texel Rate

The Radeon HD 6850 will be quite a bit (approximately 49%) better at anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 12200 (49%)

Pixel Rate

The Radeon HD 6850 is a lot (more or less 148%) more effective at FSAA than the Radeon HD 4850 2GB, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 14800 (148%)

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 4850 2GB

Amazon.com

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Radeon HD 6850

Amazon.com

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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 4850 2GB Radeon HD 6850
Manufacturer AMD AMD
Year Jun 25, 2008 October 2010
Code Name RV770 PRO Barts Pro
Memory 2048 MB 1024 MB
Core Speed 625 MHz 775 MHz
Memory Speed 1986 MHz 4000 MHz
Power (Max TDP) 110 watts 127 watts
Bandwidth 63552 MB/sec 128000 MB/sec
Texel Rate 25000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800(160x5) 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 6850

Amazon.com

Check prices at:

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.

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