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

Intro

The Radeon HD 5450 comes with a GPU core speed of 650 MHz, and the 512 MB of DDR3 memory runs 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 all of that to the Radeon HD 6450 (OEM) 1GB, which has a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 RAM running at 900 MHz through a 64-bit bus. It also is comprised of 160 SPUs, 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 6450 (OEM) 1GB 31 Watts
Difference: 12 Watts (63%)

Memory Bandwidth

Performance-wise, the Radeon HD 6450 (OEM) 1GB should theoretically be a lot better 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 is a little bit (more or less 15%) more effective 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 high levels of AA is important to you, then the Radeon HD 6450 (OEM) 1GB is superior to the Radeon HD 5450, but not by far. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 5450

Amazon.com

Other US-based stores

Radeon HD 6450 (OEM) 1GB

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 5450 Radeon HD 6450 (OEM) 1GB
Manufacturer ATi ATi
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 (measured in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability 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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