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Radeon HD 3870 X2 512MB vs Radeon HD 5670

Intro

The Radeon HD 3870 X2 512MB features clock speeds of 825 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 5670, which comes with a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also features 400(80x5) SPUs, 20 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 X2 512MB should perform a lot faster than the Radeon HD 5670 in general. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 51200 (80%)

Texel Rate

The Radeon HD 3870 X2 512MB should be much (more or less 70%) faster with regards to AF than the Radeon HD 5670. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 10900 (70%)

Pixel Rate

The Radeon HD 3870 X2 512MB should be a lot (more or less 326%) better at AA than the Radeon HD 5670, and also should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 20200 (326%)

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 512MB

Amazon.com

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Radeon HD 5670

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 512MB Radeon HD 5670
Manufacturer AMD AMD
Year Jan 28, 2008 January 14, 2010
Code Name R680 Redwood XT
Memory 512 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 775 MHz
Memory Speed 1800 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 61 watts
Bandwidth 115200 MB/sec 64000 MB/sec
Texel Rate 26400 Mtexels/sec 15500 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 6200 Mpixels/sec
Unified Shaders 320(64x5) (x2) 400(80x5)
Texture Mapping Units 16 (x2) 20
Render Output Units 16 (x2) 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 627 million
Bus PCIe 2.0 x16/(internal PCIe 1.1 x16) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should 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, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon HD 5670

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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