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Radeon HD 5450 vs Radeon HD 6450 (OEM) 1GB


The Radeon HD 5450 comes with a GPU core speed of 650 MHz, and the 512 MB of DDR3 RAM runs at 800 MHz through a 64-bit bus. It also is made up of 80(16x5) Stream Processors, 8 TAUs, and 4 ROPs.

Compare that to the Radeon HD 6450 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM works at a frequency of 900 MHz on this model. It features 160 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 6450 (OEM) 1GB 31 Watts
Difference: 12 Watts (63%)

Memory Bandwidth

Performance-wise, the Radeon HD 6450 (OEM) 1GB should theoretically be much superior to the Radeon HD 5450 in general. (explain)

Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 16000 (125%)

Texel Rate

The Radeon HD 6450 (OEM) 1GB is a small bit (approximately 15%) better at texture filtering than the Radeon HD 5450. (explain)

Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 800 (15%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6450 (OEM) 1GB is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 400 (15%)

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

Radeon HD 6450 (OEM) 1GB

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.


Display Specifications

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Model Radeon HD 5450 Radeon HD 6450 (OEM) 1GB
Manufacturer AMD AMD
Year February 4, 2010 February 2011
Code Name Cedar PRO Caicos
Memory 512 MB 1024 MB
Core Speed 650 MHz 750 MHz
Memory Speed 1600 MHz 3600 MHz
Power (Max TDP) 19 watts 31 watts
Bandwidth 12800 MB/sec 28800 MB/sec
Texel Rate 5200 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 3000 Mpixels/sec
Unified Shaders 80(16x5) 160
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR3 GDDR5
Bus Width 64-bit 64-bit
Fab Process 40 nm 40 nm
Transistors 292 million 370 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video 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 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.


6 Responses to “Radeon HD 5450 vs Radeon HD 6450 (OEM) 1GB”
Consigli su configurazione - Pagina 6 - Forum di Tom's Hardware says:

[...] [...]

Rey says:

the HD 5450 is a very good HTPC card. i added one to a tiny emachines pc, swapped in a blu ray player and that little machine is a movie monster. i do not play games on it so i dunno how games work on it.

Mentor54 says:

I wonder why the actual performance difference in pixel/texel rate isn't that big as the difference in memory bandwith suggests.

Mentor54 says:

I wonder why the actual performance difference in pixel/texel rate isn't that big as the difference in memory bandwidth suggests.

LEEROY says:

@Mentor54 - I doubt you'll see this, but --> The reason the real world differences aren't huge is simple. The memory bandwidth is a lot higher, but the actual core isn't pushing out much more.

Anonymous says:

if I install a 6450, do I need to upgrade the power supply?

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