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Radeon HD 4550 256MB vs Radeon HD 5450

Intro

The Radeon HD 4550 256MB comes with a clock frequency of 600 MHz and a DDR3 memory frequency of 800 MHz. It also makes use of a 64-bit bus, and uses a 55 nm design. It is made up of 80(16x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare that to the Radeon HD 5450, which comes with core clock speeds of 650 MHz on the GPU, and 800 MHz on the 512 MB of DDR3 RAM. It features 80(16x5) SPUs along with 8 Texture Address Units and 4 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 4550 256MB 25 Watts
Difference: 6 Watts (32%)

Memory Bandwidth

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

Texel Rate

The Radeon HD 5450 will be a little bit (approximately 8%) faster with regards to texture filtering than the Radeon HD 4550 256MB. (explain)

Radeon HD 5450 5200 Mtexels/sec
Radeon HD 4550 256MB 4800 Mtexels/sec
Difference: 400 (8%)

Pixel Rate

The Radeon HD 5450 will be just a bit (more or less 8%) faster with regards to anti-aliasing than the Radeon HD 4550 256MB, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 5450 2600 Mpixels/sec
Radeon HD 4550 256MB 2400 Mpixels/sec
Difference: 200 (8%)

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

Radeon HD 4550 256MB

Amazon.com

Radeon HD 5450

Amazon.com

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

Model Radeon HD 4550 256MB Radeon HD 5450
Manufacturer AMD AMD
Year Sep 30, 2008 February 4, 2010
Code Name RV710 Cedar PRO
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16 PCIe 2.1 x16
Memory 256 MB 512 MB
Core Speed 600 MHz 650 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 800 MHz (1600 MHz effective) 800 MHz (1600 MHz effective)
Unified Shaders 80(16x5) 80(16x5)
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2
Power (Max TDP) 25 watts 19 watts
Shader Model 4.1 5.0
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 4800 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 2400 Mpixels/sec 2600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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