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Radeon HD 4850 X2 512MB vs Radeon HD 5970

Intro

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

Compare those specs to the Radeon HD 5970, which comes with core clock speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 1600 SPUs as well as 160 Texture Address Units and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 X2 512MB 250 Watts
Radeon HD 5970 294 Watts
Difference: 44 Watts (18%)

Memory Bandwidth

Performance-wise, the Radeon HD 5970 should in theory be quite a bit better than the Radeon HD 4850 X2 512MB overall. (explain)

Radeon HD 5970 256000 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 128896 (101%)

Texel Rate

The Radeon HD 5970 will be much (about 364%) faster with regards to AF than the Radeon HD 4850 X2 512MB. (explain)

Radeon HD 5970 232000 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 182000 (364%)

Pixel Rate

The Radeon HD 5970 will be much (approximately 364%) more effective at full screen anti-aliasing than the Radeon HD 4850 X2 512MB, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 5970 92800 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 72800 (364%)

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 5970

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 5970
Manufacturer AMD AMD
Year Nov 7, 2008 November 2009
Code Name R700 Hemlock XT
Memory 512 MB (x2) 1024 MB (x2)
Core Speed 625 MHz (x2) 725 MHz (x2)
Memory Speed 1986 MHz (x2) 4000 MHz (x2)
Power (Max TDP) 250 watts 294 watts
Bandwidth 127104 MB/sec 256000 MB/sec
Texel Rate 50000 Mtexels/sec 232000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 92800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1600 (x2)
Texture Mapping Units 40 (x2) 160 (x2)
Render Output Units 16 (x2) 64 (x2)
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit (x2)
Fab Process 55 nm 40 nm
Transistors 956 million 2154 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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 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 applied in one second. This number is calculated by multiplying the total texture units 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 5970

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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