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Radeon HD 3870 512MB vs Radeon HD 5830

Intro

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

Compare all that to the Radeon HD 5830, which has a clock frequency of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 256-bit bus, and uses a 40 nm design. It is made up of 1120(224x5) SPUs, 56 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 512MB 106 Watts
Radeon HD 5830 175 Watts
Difference: 69 Watts (65%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5830 should perform much faster than the Radeon HD 3870 512MB in general. (explain)

Radeon HD 5830 128000 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 70400 (122%)

Texel Rate

The Radeon HD 5830 is quite a bit (more or less 261%) better at AF than the Radeon HD 3870 512MB. (explain)

Radeon HD 5830 44800 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 32400 (261%)

Pixel Rate

The Radeon HD 5830 should be a little bit (about 3%) better at full screen anti-aliasing than the Radeon HD 3870 512MB, and also will be able to handle higher resolutions better. (explain)

Radeon HD 5830 12800 Mpixels/sec
Radeon HD 3870 512MB 12400 Mpixels/sec
Difference: 400 (3%)

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

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Radeon HD 5830

Amazon.com

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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 5830
Manufacturer AMD AMD
Year Nov 19, 2007 February 25, 2010
Code Name RV670 XT Cypress LE
Memory 512 MB 1024 MB
Core Speed 775 MHz 800 MHz
Memory Speed 1800 MHz 4000 MHz
Power (Max TDP) 106 watts 175 watts
Bandwidth 57600 MB/sec 128000 MB/sec
Texel Rate 12400 Mtexels/sec 44800 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 320(64x5) 1120(224x5)
Texture Mapping Units 16 56
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 2154 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 max amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon HD 5830

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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