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Radeon HD 5450 vs Radeon HD 6450 (OEM)

Intro

The Radeon HD 5450 has a GPU core clock speed of 650 MHz, and the 512 MB of DDR3 RAM is set to run at 800 MHz through a 64-bit bus. It also is made up of 80(16x5) SPUs, 8 Texture Address Units, and 4 ROPs.

Compare that to the Radeon HD 6450 (OEM), which has core clock speeds of 625 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 RAM. 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) 31 Watts
Difference: 12 Watts (63%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 5450 should be a small bit (about 4%) faster with regards to texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 5450 5200 Mtexels/sec
Radeon HD 6450 (OEM) 5000 Mtexels/sec
Difference: 200 (4%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 5450 is a better choice, but it probably won't make a huge difference. (explain)

Radeon HD 5450 2600 Mpixels/sec
Radeon HD 6450 (OEM) 2500 Mpixels/sec
Difference: 100 (4%)

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

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Radeon HD 6450 (OEM)

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 6450 (OEM)
Manufacturer AMD AMD
Year February 4, 2010 February 2011
Code Name Cedar PRO Caicos
Memory 512 MB 512 MB
Core Speed 650 MHz 625 MHz
Memory Speed 1600 MHz 1600 MHz
Power (Max TDP) 19 watts 31 watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 5200 Mtexels/sec 5000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 2500 Mpixels/sec
Unified Shaders 80(16x5) 160
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR3 GDDR3
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 maximum amount of information (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 5450

Amazon.com

Check prices at:

Radeon HD 6450 (OEM)

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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