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Radeon HD 4870 2GB vs Radeon HD 6870

Intro

The Radeon HD 4870 2GB comes with a GPU clock speed of 750 MHz, and the 2048 MB of GDDR5 RAM runs at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6870, which has a clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1120 SPUs, 56 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 2GB 150 Watts
Radeon HD 6870 151 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

In theory, the Radeon HD 6870 will be 17% faster than the Radeon HD 4870 2GB overall, because of its higher bandwidth. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4870 2GB 115200 MB/sec
Difference: 19200 (17%)

Texel Rate

The Radeon HD 6870 is much (more or less 68%) more effective at AF than the Radeon HD 4870 2GB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4870 2GB 30000 Mtexels/sec
Difference: 20400 (68%)

Pixel Rate

The Radeon HD 6870 should be quite a bit (about 140%) more effective at full screen anti-aliasing than the Radeon HD 4870 2GB, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4870 2GB 12000 Mpixels/sec
Difference: 16800 (140%)

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 4870 2GB

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 2GB Radeon HD 6870
Manufacturer AMD AMD
Year Jun 25, 2008 October 2010
Code Name RV770 XT Barts XT
Memory 2048 MB 1024 MB
Core Speed 750 MHz 900 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 150 watts 151 watts
Bandwidth 115200 MB/sec 134400 MB/sec
Texel Rate 30000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800(160x5) 1120
Texture Mapping Units 40 56
Render Output Units 16 32
Bus Type GDDR5 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 data (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4870 2GB

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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