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Radeon HD 4550 256MB vs Radeon HD 5550

Intro

The Radeon HD 4550 256MB comes with clock speeds of 600 MHz on the GPU, and 800 MHz on the 256 MB of DDR3 RAM. It features 80(16x5) SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specifications to the Radeon HD 5550, which has a clock speed of 550 MHz and a DDR2 memory speed of 400 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 320(64x5) SPUs, 16 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 5550 will be a lot (approximately 83%) faster with regards to anisotropic filtering than the Radeon HD 4550 256MB. (explain)

Radeon HD 5550 8800 Mtexels/sec
Radeon HD 4550 256MB 4800 Mtexels/sec
Difference: 4000 (83%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5550 is the winner, by far. (explain)

Radeon HD 5550 4400 Mpixels/sec
Radeon HD 4550 256MB 2400 Mpixels/sec
Difference: 2000 (83%)

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 4550 256MB

Amazon.com

Check prices at:

Radeon HD 5550

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 4550 256MB Radeon HD 5550
Manufacturer AMD AMD
Year Sep 30, 2008 February 9, 2010
Code Name RV710 Redwood LE
Memory 256 MB 512 MB
Core Speed 600 MHz 550 MHz
Memory Speed 1600 MHz 800 MHz
Power (Max TDP) 25 watts (Unknown) watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 4800 Mtexels/sec 8800 Mtexels/sec
Pixel Rate 2400 Mpixels/sec 4400 Mpixels/sec
Unified Shaders 80(16x5) 320(64x5)
Texture Mapping Units 8 16
Render Output Units 4 8
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 242 million 627 million
Bus PCIe 2.0 x16 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 maximum amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a 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 calculated by multiplying the amount of Render Output Units by the the card's clock speed. 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 lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4550 256MB

Amazon.com

Check prices at:

Radeon HD 5550

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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