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

Intro

The Radeon HD 5450 makes use of a 40 nm design. AMD has clocked the core speed at 650 MHz. The DDR3 memory is set to run at a speed of 800 MHz on this model. It features 80(16x5) SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare those specs to the Radeon HD 6450 (OEM) 1GB, which has clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 160 SPUs as well as 8 Texture Address Units 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

Theoretically speaking, the Radeon HD 6450 (OEM) 1GB should be 125% quicker than the Radeon HD 5450 in general, due to its higher data rate. (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 (about 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 using a high resolution is important to you, then the Radeon HD 6450 (OEM) 1GB is a better choice, not by a very large margin though. (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

Amazon.com

Radeon HD 6450 (OEM) 1GB

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

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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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the 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 amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the 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 could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

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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