The Radeon HD 5770 features a GPU core speed of 850 MHz, and the 1024 MB of GDDR5 RAM runs at 1200 MHz through a 128-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 ROPs. Compare those specifications to the Radeon HD 6770 1GB, which has core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.
Power, Temperatures and Theoretical Benchmarks
Both cards have the same power consumption. Memory Bandwidth
As far as performance goes, the Radeon HD 5770 should in theory be just a bit superior to the Radeon HD 6770 1GB overall. (explain)
Radeon HD 5770 76800 MB/sec Radeon HD 6770 67200 MB/sec Difference: 9600 (14%) Texel Rate
The Radeon HD 6770 1GB is just a bit (about 6%) better at anisotropic filtering than the Radeon HD 5770. (explain) Radeon HD 6770 36000 Mtexels/sec Radeon HD 5770 34000 Mtexels/sec Difference: 2000 (6%) Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 6770 1GB is a better choice, but only just. (explain) Radeon HD 6770 14400 Mpixels/sec Radeon HD 5770 13600 Mpixels/sec Difference: 800 (6%)
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.
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