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Radeon HD 5450 vs Radeon HD 6850

Intro

The Radeon HD 5450 uses a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 memory works at a speed of 800 MHz on this model. It features 80(16x5) SPUs along with 8 Texture Address Units and 4 ROPs.

Compare those specs to the Radeon HD 6850, which has clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 6850 127 Watts
Difference: 108 Watts (568%)

Memory Bandwidth

In theory, the Radeon HD 6850 should perform a lot faster than the Radeon HD 5450 in general. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 115200 (900%)

Texel Rate

The Radeon HD 6850 will be much (more or less 615%) faster with regards to texture filtering than the Radeon HD 5450. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 32000 (615%)

Pixel Rate

The Radeon HD 6850 will be a lot (approximately 854%) better at anti-aliasing than the Radeon HD 5450, and should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 22200 (854%)

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 6850

Amazon.com

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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 6850
Manufacturer AMD AMD
Year February 4, 2010 October 2010
Code Name Cedar PRO Barts Pro
Memory 512 MB 1024 MB
Core Speed 650 MHz 775 MHz
Memory Speed 1600 MHz 4000 MHz
Power (Max TDP) 19 watts 127 watts
Bandwidth 12800 MB/sec 128000 MB/sec
Texel Rate 5200 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 80(16x5) 960
Texture Mapping Units 8 48
Render Output Units 4 32
Bus Type DDR3 GDDR5
Bus Width 64-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 292 million 1700 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 5450

Amazon.com

Check prices at:

Radeon HD 6850

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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