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Radeon HD 3870 512MB vs Radeon HD 5670

Intro

The Radeon HD 3870 512MB features a clock frequency of 775 MHz and a GDDR3 memory frequency of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 5670, which has core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 400(80x5) SPUs along with 20 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 45 Watts (74%)

Memory Bandwidth

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

Radeon HD 5670 64000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 6400 (11%)

Texel Rate

The Radeon HD 5670 is a lot (approximately 25%) better at AF than the Radeon HD 3870 512MB. (explain)

Radeon HD 5670 15500 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 3100 (25%)

Pixel Rate

The Radeon HD 3870 512MB is quite a bit (approximately 100%) faster with regards to AA than the Radeon HD 5670, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 3870 512MB 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 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.

Specifications

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Model Radeon HD 3870 512MB Radeon HD 5670
Manufacturer AMD AMD
Year Nov 19, 2007 January 14, 2010
Code Name RV670 XT Redwood XT
Memory 512 MB 1024 MB
Core Speed 775 MHz 775 MHz
Memory Speed 1800 MHz 4000 MHz
Power (Max TDP) 106 watts 61 watts
Bandwidth 57600 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 GDDR3 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 (in units of megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 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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