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Radeon HD 3870 1GB vs Radeon HD 5670

Intro

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

Compare those specifications to the Radeon HD 5670, which features a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is comprised of 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

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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

The Radeon HD 3870 1GB should theoretically be a bit faster than the Radeon HD 5670 overall. (explain)

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

Texel Rate

The Radeon HD 5670 is a lot (approximately 25%) better at 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 a high screen resolution is important to you, then the Radeon HD 3870 1GB is superior to the Radeon HD 5670, by a large margin. (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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed 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 the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max 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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