HP Z420 CPU Supports

HI Everyone

i have this ''HP Z420 Z1 G2 LGA2011'' board

I would like to know which processor supports?

it is supprot a-14nm- like ''E5-2689V4''

or maby  -22nm- like ''E5-2670V2''

or maby  -32nm- like ''E5-2660''

and which series is fit\supports ? ''E5-26XX'' or ''E5-16XX''?

like this cpu:''E5-1650 SR0KZ 6 Core'' Would it workfor me ?

another questionWhat is the differencebetween ''FCLGA2011'' and ''LGA 2011''?

Sorryif that'sa lot ofquestions
Iwants toknow whichprocessor tobuy

I'm already confused
If can someone shed some light on this,I Would really apriciate that
Many thanks!