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Radeon HD 4550 512MB vs Radeon HD 7770

Intro

The Radeon HD 4550 512MB comes with core speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 RAM. It features 80(16x5) SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7770, which has a clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB 25 Watts
Radeon HD 7770 80 Watts
Difference: 55 Watts (220%)

Memory Bandwidth

Theoretically, the Radeon HD 7770 should perform quite a bit faster than the Radeon HD 4550 512MB overall. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 4550 512MB 12800 MB/sec
Difference: 59200 (463%)

Texel Rate

The Radeon HD 7770 should be much (approximately 733%) more effective at texture filtering than the Radeon HD 4550 512MB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 4550 512MB 4800 Mtexels/sec
Difference: 35200 (733%)

Pixel Rate

The Radeon HD 7770 should be a lot (about 567%) better at FSAA than the Radeon HD 4550 512MB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 4550 512MB 2400 Mpixels/sec
Difference: 13600 (567%)

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 4550 512MB

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 4550 512MB Radeon HD 7770
Manufacturer AMD AMD
Year Sep 30, 2008 February 2012
Code Name RV710 Cape Verde XT
Memory 512 MB 1024 MB
Core Speed 600 MHz 1000 MHz
Memory Speed 1600 MHz 4500 MHz
Power (Max TDP) 25 watts 80 watts
Bandwidth 12800 MB/sec 72000 MB/sec
Texel Rate 4800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 2400 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 80(16x5) 640
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type GDDR3 GDDR5
Bus Width 64-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 242 million 1500 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4550 512MB

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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