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Radeon HD 4870 X2 vs Radeon HD 6870

Intro

The Radeon HD 4870 X2 uses a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory works at a speed of 900 MHz on this model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this specific card. It features 1120 SPUs as well as 56 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 4870 X2 350 Watts
Difference: 199 Watts (132%)

Memory Bandwidth

The Radeon HD 4870 X2 should theoretically be much faster than the Radeon HD 6870 overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 96000 (71%)

Texel Rate

The Radeon HD 4870 X2 should be a little bit (more or less 19%) faster with regards to texture filtering than the Radeon HD 6870. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 9600 (19%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6870 is a better choice, not by a very large margin though. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 4800 (20%)

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 4870 X2

Amazon.com

Check prices at:

Radeon HD 6870

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 4870 X2 Radeon HD 6870
Manufacturer AMD AMD
Year Aug 12, 2008 October 2010
Code Name R700 Barts XT
Memory 1024 MB (x2) 1024 MB
Core Speed 750 MHz (x2) 900 MHz
Memory Speed 3600 MHz (x2) 4200 MHz
Power (Max TDP) 350 watts 151 watts
Bandwidth 230400 MB/sec 134400 MB/sec
Texel Rate 60000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1120
Texture Mapping Units 40 (x2) 56
Render Output Units 16 (x2) 32
Bus Type GDDR5 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 maximum amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 X2

Amazon.com

Check prices at:

Radeon HD 6870

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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