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Radeon HD 5450 vs Radeon HD 6790

Intro

The Radeon HD 5450 has a clock speed of 650 MHz and a DDR3 memory speed of 800 MHz. It also makes use of a 64-bit bus, and uses a 40 nm design. It features 80(16x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

Compare all that to the Radeon HD 6790, which features a clock speed of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
Radeon HD 6790 150 Watts
Difference: 131 Watts (689%)

Memory Bandwidth

Theoretically, the Radeon HD 6790 should be much faster than the Radeon HD 5450 in general. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 121600 (950%)

Texel Rate

The Radeon HD 6790 will be quite a bit (approximately 546%) faster with regards to texture filtering than the Radeon HD 5450. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 28400 (546%)

Pixel Rate

The Radeon HD 6790 will be quite a bit (approximately 417%) better at AA than the Radeon HD 5450, and able to handle higher resolutions better. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 10840 (417%)

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 6790

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 6790
Manufacturer AMD AMD
Year February 4, 2010 April 2011
Code Name Cedar PRO Barts LE
Memory 512 MB 1024 MB
Core Speed 650 MHz 840 MHz
Memory Speed 1600 MHz 4200 MHz
Power (Max TDP) 19 watts 150 watts
Bandwidth 12800 MB/sec 134400 MB/sec
Texel Rate 5200 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 80(16x5) 800
Texture Mapping Units 8 40
Render Output Units 4 16
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 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). 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.

Display Prices

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Radeon HD 5450

Amazon.com

Check prices at:

Radeon HD 6790

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.

Comments

One Response to “Radeon HD 5450 vs Radeon HD 6790”
Anonymous says:

Hi performance but noisy

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