Supermicro more efficient

Hello everyone, i just got a supermicro with 24 bays, and i wanted to replace the cpu with a more efficient one.
What are the alternatives for a  Intel(R) Xeon(R) CPU E3-1220 v6 @ 3.00GHz ?
its on a MB X11SSL-F
it have ecc ram
my alternatives would be a i3 6 or 7th gen but the its a worse cpu
or maybe a Xeon E3-1230L v6 that as a lower tdp and 4 more threads or even this: Xeon E3-1260L v5
thanks in advance to everyone that can help