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Radeon HD 4550 256MB vs Radeon HD 5550

Intro

The Radeon HD 4550 256MB features a GPU core speed of 600 MHz, and the 256 MB of DDR3 RAM is set to run at 800 MHz through a 64-bit bus. It also is comprised of 80(16x5) Stream Processors, 8 Texture Address Units, and 4 ROPs.

Compare all that to the Radeon HD 5550, which has GPU clock speed of 550 MHz, and 512 MB of DDR2 RAM running at 400 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have exactly the same bandwidth, so theoretically they should have identical performance. (explain)

Texel Rate

The Radeon HD 5550 is much (about 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 resolution is important to you, then the Radeon HD 5550 is a better choice, by a large margin. (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 transported past the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 number of texture map elements (texels) that are processed in one second. This number 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential 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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