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Radeon HD 4890 2GB vs Radeon HD 6850

Intro

The Radeon HD 4890 2GB uses a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory works at a speed of 975 MHz on this particular model. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 6850, which features core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 63 Watts (50%)

Memory Bandwidth

In theory, the Radeon HD 6850 should perform a little bit faster than the Radeon HD 4890 2GB in general. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4890 2GB 124800 MB/sec
Difference: 3200 (3%)

Texel Rate

The Radeon HD 4890 2GB will be just a bit (approximately 8%) better at AF than the Radeon HD 6850. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 2800 (8%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6850 is the winner, and very much so. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4890 2GB 16000 Mpixels/sec
Difference: 8800 (55%)

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 4890 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 4890 2GB Radeon HD 6850
Manufacturer AMD AMD
Year Apr 2, 2009 October 2010
Code Name RV790 XT Barts Pro
Memory 2048 MB 1024 MB
Core Speed 1000 MHz 775 MHz
Memory Speed 3900 MHz 4000 MHz
Power (Max TDP) 190 watts 127 watts
Bandwidth 124800 MB/sec 128000 MB/sec
Texel Rate 40000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800(160x5) 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 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 max amount of data (in units of MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling 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 that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4890 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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