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Radeon HD 3870 1GB vs Radeon HD 6670 (OEM)

Intro

The Radeon HD 3870 1GB makes use of a 55 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR4 memory runs at a speed of 1125 MHz on this card. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon HD 6670 (OEM), which has GPU core speed of 800 MHz, and 512 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is made up of 480 Stream Processors, 24 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 63 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 43 Watts (68%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 1GB should theoretically be just a bit superior to the Radeon HD 6670 (OEM) overall. (explain)

Radeon HD 3870 1GB 72000 MB/sec
Radeon HD 6670 (OEM) 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 6670 (OEM) is much (more or less 55%) better at anisotropic filtering than the Radeon HD 3870 1GB. (explain)

Radeon HD 6670 (OEM) 19200 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 6800 (55%)

Pixel Rate

The Radeon HD 3870 1GB will be quite a bit (approximately 94%) faster with regards to FSAA than the Radeon HD 6670 (OEM), and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 6670 (OEM) 6400 Mpixels/sec
Difference: 6000 (94%)

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 3870 1GB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM)

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 1GB Radeon HD 6670 (OEM)
Manufacturer AMD AMD
Year Nov 19, 2007 February 2011
Code Name RV670 XT Turks
Memory 1024 MB 512 MB
Core Speed 775 MHz 800 MHz
Memory Speed 2250 MHz 4000 MHz
Power (Max TDP) 106 watts 63 watts
Bandwidth 72000 MB/sec 64000 MB/sec
Texel Rate 12400 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 320(64x5) 480
Texture Mapping Units 16 24
Render Output Units 16 8
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 715 million
Bus PCIe 2.0 x16/AGP 8x 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 largest amount of information (in units of MB 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. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 6670 (OEM)

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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