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Radeon HD 3870 512MB vs Radeon HD 4550 512MB

Intro

The Radeon HD 3870 512MB features core clock speeds of 775 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 4550 512MB, which has core clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 RAM. It features 80(16x5) SPUs along with 8 TAUs and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB 25 Watts
Radeon HD 3870 512MB 106 Watts
Difference: 81 Watts (324%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 512MB should perform a lot faster than the Radeon HD 4550 512MB in general. (explain)

Radeon HD 3870 512MB 57600 MB/sec
Radeon HD 4550 512MB 12800 MB/sec
Difference: 44800 (350%)

Texel Rate

The Radeon HD 3870 512MB is quite a bit (approximately 158%) better at AF than the Radeon HD 4550 512MB. (explain)

Radeon HD 3870 512MB 12400 Mtexels/sec
Radeon HD 4550 512MB 4800 Mtexels/sec
Difference: 7600 (158%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 3870 512MB is the winner, and very much so. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
Radeon HD 4550 512MB 2400 Mpixels/sec
Difference: 10000 (417%)

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 4550 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 512MB Radeon HD 4550 512MB
Manufacturer AMD AMD
Year Nov 19, 2007 Sep 30, 2008
Code Name RV670 XT RV710
Memory 512 MB 512 MB
Core Speed 775 MHz 600 MHz
Memory Speed 1800 MHz 1600 MHz
Power (Max TDP) 106 watts 25 watts
Bandwidth 57600 MB/sec 12800 MB/sec
Texel Rate 12400 Mtexels/sec 4800 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 2400 Mpixels/sec
Unified Shaders 320(64x5) 80(16x5)
Texture Mapping Units 16 8
Render Output Units 16 4
Bus Type GDDR3 GDDR3
Bus Width 256-bit 64-bit
Fab Process 55 nm 55 nm
Transistors (Unknown) million 242 million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling 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 its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 3870 512MB

Amazon.com

Check prices at:

Radeon HD 4550 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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