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Radeon HD 5450 vs Radeon HD 7770

Intro

The Radeon HD 5450 has a GPU clock speed of 650 MHz, and the 512 MB of DDR3 memory is set to run at 800 MHz through a 64-bit bus. It also features 80(16x5) Stream Processors, 8 Texture Address Units, and 4 ROPs.

Compare that to the Radeon HD 7770, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 Texture Address Units, 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 7770 80 Watts
Difference: 61 Watts (321%)

Memory Bandwidth

In theory, the Radeon HD 7770 will be 463% faster than the Radeon HD 5450 overall, because of its greater data rate. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 59200 (463%)

Texel Rate

The Radeon HD 7770 should be a lot (more or less 669%) better at anisotropic filtering than the Radeon HD 5450. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 34800 (669%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7770 is the winner, by a large margin. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 13400 (515%)

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

Check prices at:

Radeon HD 7770

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.

Specifications

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Model Radeon HD 5450 Radeon HD 7770
Manufacturer AMD AMD
Year February 4, 2010 February 2012
Code Name Cedar PRO Cape Verde XT
Memory 512 MB 1024 MB
Core Speed 650 MHz 1000 MHz
Memory Speed 1600 MHz 4500 MHz
Power (Max TDP) 19 watts 80 watts
Bandwidth 12800 MB/sec 72000 MB/sec
Texel Rate 5200 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 80(16x5) 640
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type DDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 292 million 1500 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better 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 most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 5450

Amazon.com

Check prices at:

Radeon HD 7770

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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