ZFS cpu requirements, with/out compression and/or dedup

[Sami Halabi]

Hi everyone,
I've been searching the documentation, wiki.. etc. but found no rule of
thumb to CPU requirements to run ZFS fs. for memory there are few rules
according to using dedup or not.

rules of thumb I concluded are so far:
1. use compression lz4.
2. use checksum.
3. disable atime.

from what i read the status of dedup is not that clear and seems there are
bugs and better to avoid it?

so according to 1-3 above what cpu requirements i need? is ATOM cpu like
supermicro c2750/3/5/8 enough to run system of 20TB /40TB with 1-3 above?
if dedup IS enabled would it still work fine?

Thanks in advance,
Sami halabi