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

Intro

The Radeon HD 5450 has a core clock frequency of 650 MHz and a DDR3 memory frequency of 800 MHz. It also features a 64-bit memory bus, and uses a 40 nm design. It is made up of 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare those specs 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 particular model. It features 160 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

In theory, the Radeon HD 6450 (OEM) 1GB should perform much faster than 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 should be a small bit (approximately 15%) better at anisotropic 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

The Radeon HD 6450 (OEM) 1GB will be a bit (approximately 15%) faster with regards to FSAA than the Radeon HD 5450, and capable of handling higher screen resolutions without slowing down too much. (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

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

Model Radeon HD 5450 Radeon HD 6450 (OEM) 1GB
Manufacturer AMD AMD
Year February 4, 2010 February 2011
Code Name Cedar PRO Caicos
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 650 MHz 750 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 800 MHz (1600 MHz effective) 900 MHz (3600 MHz effective)
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
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1
Power (Max TDP) 19 watts 31 watts
Shader Model 5.0 5.0
Bandwidth 12800 MB/sec 28800 MB/sec
Texel Rate 5200 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 3000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one 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 calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

5 Responses to “Radeon HD 5450 vs Radeon HD 6450 (OEM) 1GB”
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.

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