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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 memory. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 4550 512MB, which comes with 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 Texture Address Units 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

As far as performance goes, the Radeon HD 3870 512MB should in theory be quite a bit better 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 (about 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

The Radeon HD 3870 512MB will be a lot (approximately 417%) faster with regards to full screen anti-aliasing than the Radeon HD 4550 512MB, and should be able to handle higher resolutions better. (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

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Radeon HD 4550 512MB

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 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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units by the core 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum 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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