Please i need to understand what make some GPU has more hashrates than others, from the following list of GPU features which exactly is the main responsible for better or high hashreates:

1. Core Clock(Mhz)
2. Memory Capacity
3. Stream Processors
4. Memory Speed
5. Memory Clock(Mhz)
6. Process:(xx nanometers)
7. PixelPipelines
8. Memory Interface: (128, 256 Bit or higher)