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

Intro

The Radeon HD 5450 features a 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 comprised of 80(16x5) SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

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 memory running at 900 MHz through a 64-bit bus. It also is comprised of 160 Stream Processors, 8 TAUs, 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

The Radeon HD 6450 (OEM) 1GB should theoretically perform quite a bit faster than the Radeon HD 5450 overall. (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 will be just a bit (more or less 15%) more effective 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 6450 (OEM) 1GB is a better choice, but only just. (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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max 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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