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Radeon HD 3870 1GB vs Radeon HD 3870 512MB

Intro

The Radeon HD 3870 1GB features a GPU clock speed of 775 MHz, and the 1024 MB of GDDR4 memory runs at 1125 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 3870 512MB, which features core clock speeds of 775 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 1GB should be a lot faster than the Radeon HD 3870 512MB overall. (explain)

Radeon HD 3870 1GB 72000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 14400 (25%)

Texel Rate

Both cards have exactly the same texel rate, so in theory they should perform equally good at at AF. (explain)

Pixel Rate

Both cards have exactly the same pixel fill rate, so in theory they should perform equally good at at AA, and be capable of handling the same screen resolutions. (explain)

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 3870 512MB

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 3870 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Nov 19, 2007
Code Name RV670 XT RV670 XT
Memory 1024 MB 512 MB
Core Speed 775 MHz 775 MHz
Memory Speed 2250 MHz 1800 MHz
Power (Max TDP) 106 watts 106 watts
Bandwidth 72000 MB/sec 57600 MB/sec
Texel Rate 12400 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 320(64x5) 320(64x5)
Texture Mapping Units 16 16
Render Output Units 16 16
Bus Type GDDR4 GDDR3
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably 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 1GB

Amazon.com

Check prices at:

Radeon HD 3870 512MB

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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