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Radeon HD 4870 512MB vs Radeon HD 6870

Intro

The Radeon HD 4870 512MB has clock speeds of 750 MHz on the GPU, and 900 MHz on the 512 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 6870, which features GPU core speed of 900 MHz, and 1024 MB of GDDR5 RAM set to run at 1050 MHz through a 256-bit bus. It also is comprised of 1120 Stream Processors, 56 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 512MB 150 Watts
Radeon HD 6870 151 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

The Radeon HD 6870, in theory, should perform a little bit faster than the Radeon HD 4870 512MB overall. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4870 512MB 115200 MB/sec
Difference: 19200 (17%)

Texel Rate

The Radeon HD 6870 will be a lot (more or less 68%) better at anisotropic filtering than the Radeon HD 4870 512MB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 20400 (68%)

Pixel Rate

The Radeon HD 6870 is quite a bit (more or less 140%) better at FSAA than the Radeon HD 4870 512MB, and also capable of handling higher resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4870 512MB 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 512MB

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 512MB Radeon HD 6870
Manufacturer AMD AMD
Year Jun 25, 2008 October 2010
Code Name RV770 XT Barts XT
Memory 512 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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range 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 amount of texture units by the core clock speed of the chip. The higher this number, 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 graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 512MB

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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