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Radeon HD 5450 vs Radeon HD 5550

Intro

The Radeon HD 5450 makes use of a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 memory is set to run at a speed of 800 MHz on this particular card. It features 80(16x5) SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Compare that to the Radeon HD 5550, which has GPU clock speed of 550 MHz, and 512 MB of DDR2 memory set to run at 400 MHz through a 128-bit bus. It also features 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 memory bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 5550 should be quite a bit (about 69%) faster with regards to texture filtering than the Radeon HD 5450. (explain)

Radeon HD 5550 8800 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 3600 (69%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 5550 is a better choice, by far. (explain)

Radeon HD 5550 4400 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 1800 (69%)

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 5450

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 5450 Radeon HD 5550
Manufacturer AMD AMD
Year February 4, 2010 February 9, 2010
Code Name Cedar PRO Redwood LE
Memory 512 MB 512 MB
Core Speed 650 MHz 550 MHz
Memory Speed 1600 MHz 800 MHz
Power (Max TDP) 19 watts (Unknown) watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 5200 Mtexels/sec 8800 Mtexels/sec
Pixel Rate 2600 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 40 nm 40 nm
Transistors 292 million 627 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, 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 maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 5450

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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