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Radeon HD 5770 vs Radeon HD 7770

Intro

The Radeon HD 5770 comes with a GPU core clock speed of 850 MHz, and the 1024 MB of GDDR5 memory is set to run at 1200 MHz through a 128-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7770, which features a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 5770 108 Watts
Difference: 28 Watts (35%)

Memory Bandwidth

The Radeon HD 5770 should theoretically be a bit faster than the Radeon HD 7770 in general. (explain)

Radeon HD 5770 76800 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 4800 (7%)

Texel Rate

The Radeon HD 7770 should be just a bit (approximately 18%) better at AF than the Radeon HD 5770. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 6000 (18%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7770 is superior to the Radeon HD 5770, not by a very large margin though. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 2400 (18%)

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 5770

Amazon.com

Radeon HD 7770

Amazon.com

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 5770 Radeon HD 7770
Manufacturer AMD AMD
Year October 13, 2009 February 2012
Code Name Juniper XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 850 MHz 1000 MHz
Memory Speed 4800 MHz 4500 MHz
Power (Max TDP) 108 watts 80 watts
Bandwidth 76800 MB/sec 72000 MB/sec
Texel Rate 34000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 13600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) 640
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1040 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 across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could 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 Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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