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Radeon HD 4850 X2 512MB vs Radeon HD 6850

Intro

The Radeon HD 4850 X2 512MB comes with core speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6850, which features a clock speed of 775 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 256-bit bus, and makes use of a 40 nm design. It is made up of 960 SPUs, 48 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 123 Watts (97%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6850 should in theory be just a bit better than the Radeon HD 4850 X2 512MB in general. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 896 (1%)

Texel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (more or less 34%) faster with regards to anisotropic filtering than the Radeon HD 6850. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 12800 (34%)

Pixel Rate

The Radeon HD 6850 is quite a bit (more or less 24%) better at FSAA than the Radeon HD 4850 X2 512MB, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 4800 (24%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4850 X2 512MB

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.

Specifications

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Model Radeon HD 4850 X2 512MB Radeon HD 6850
Manufacturer AMD AMD
Year Nov 7, 2008 October 2010
Code Name R700 Barts Pro
Memory 512 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 775 MHz
Memory Speed 1986 MHz (x2) 4000 MHz
Power (Max TDP) 250 watts 127 watts
Bandwidth 127104 MB/sec 128000 MB/sec
Texel Rate 50000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 960
Texture Mapping Units 40 (x2) 48
Render Output Units 16 (x2) 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 (PCIe bridge) 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 (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 quite a few other factors, especially the memory bandwidth - 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 X2 512MB

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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