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Radeon HD 3870 X2 1GB vs Radeon HD 6870

Intro

The Radeon HD 3870 X2 1GB has a GPU core speed of 825 MHz, and the 1024 MB of GDDR4 memory runs at 1126 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

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

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3870 X2 1GB should theoretically be a little bit better than the Radeon HD 6870 overall. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 9728 (7%)

Texel Rate

The Radeon HD 6870 should be much (more or less 91%) faster with regards to anisotropic filtering than the Radeon HD 3870 X2 1GB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 24000 (91%)

Pixel Rate

The Radeon HD 6870 should be just a bit (approximately 9%) more effective at FSAA than the Radeon HD 3870 X2 1GB, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 3870 X2 1GB 26400 Mpixels/sec
Difference: 2400 (9%)

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 3870 X2 1GB

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 3870 X2 1GB Radeon HD 6870
Manufacturer AMD AMD
Year Jan 28, 2008 October 2010
Code Name R680 Barts XT
Memory 1024 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 900 MHz
Memory Speed 2252 MHz (x2) 4200 MHz
Power (Max TDP) (Unknown) watts 151 watts
Bandwidth 144128 MB/sec 134400 MB/sec
Texel Rate 26400 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 320(64x5) (x2) 1120
Texture Mapping Units 16 (x2) 56
Render Output Units 16 (x2) 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1700 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) 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 MB per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 1GB

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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