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Radeon HD 5450 vs Radeon HD 7770

Intro

The Radeon HD 5450 comes with a core clock frequency of 650 MHz and a DDR3 memory frequency of 800 MHz. It also makes use of 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 those specifications to the Radeon HD 7770, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this particular model. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

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

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

Texel Rate

The Radeon HD 7770 will be quite a bit (about 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, and very much so. (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: Bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few 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 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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