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Radeon HD 3870 1GB vs Radeon HD 5670

Intro

The Radeon HD 3870 1GB features core clock speeds of 775 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR4 memory. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 5670, which comes with GPU core speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is comprised of 400(80x5) SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 45 Watts (74%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 1GB should theoretically be just a bit superior to the Radeon HD 5670 in general. (explain)

Radeon HD 3870 1GB 72000 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 5670 is quite a bit (approximately 25%) faster with regards to AF than the Radeon HD 3870 1GB. (explain)

Radeon HD 5670 15500 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 3100 (25%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 1GB is a better choice, by far. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 6200 (100%)

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 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 1GB Radeon HD 5670
Manufacturer AMD AMD
Year Nov 19, 2007 January 14, 2010
Code Name RV670 XT Redwood XT
Memory 1024 MB 1024 MB
Core Speed 775 MHz 775 MHz
Memory Speed 2250 MHz 4000 MHz
Power (Max TDP) 106 watts 61 watts
Bandwidth 72000 MB/sec 64000 MB/sec
Texel Rate 12400 Mtexels/sec 15500 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 6200 Mpixels/sec
Unified Shaders 320(64x5) 400(80x5)
Texture Mapping Units 16 20
Render Output Units 16 8
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 627 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 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount 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 filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably 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 1GB

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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