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Radeon HD 3870 X2 512MB vs Radeon HD 6670 (OEM) 1GB

Intro

The Radeon HD 3870 X2 512MB uses a 55 nm design. AMD has set the core speed at 825 MHz. The GDDR3 memory works at a speed of 900 MHz on this card. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 6670 (OEM) 1GB, which has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 480 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3870 X2 512MB should in theory be a lot superior to the Radeon HD 6670 (OEM) 1GB overall. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 51200 (80%)

Texel Rate

The Radeon HD 3870 X2 512MB should be a lot (about 38%) faster with regards to AF than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 7200 (38%)

Pixel Rate

The Radeon HD 3870 X2 512MB should be much (about 313%) faster with regards to anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 20000 (313%)

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

Check prices at:

Radeon HD 6670 (OEM) 1GB

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 6670 (OEM) 1GB
Manufacturer AMD AMD
Year Jan 28, 2008 February 2011
Code Name R680 Turks
Memory 512 MB (x2) 1024 MB
Core Speed 825 MHz (x2) 800 MHz
Memory Speed 1800 MHz (x2) 4000 MHz
Power (Max TDP) (Unknown) watts 63 watts
Bandwidth 115200 MB/sec 64000 MB/sec
Texel Rate 26400 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 26400 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 320(64x5) (x2) 480
Texture Mapping Units 16 (x2) 24
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 715 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 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, 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 most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM) 1GB

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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