1. The main difference between fine grained and Coarse grained multithreading is that, in fine grained multithreading, the threads issue instructions in round-robin manner while in Coarse grained multithreading, the threads issue instructions until a stall occurs.

2. Each core supported four-way interleaved multithreading, with four copies of each processor register.

3. A multithreaded architecture is disclosed for managing external memory updates for fault detection in redundant multithreading systems using speculative memory support.