a similar thread was here end of last year:

From: "Joseph Marton" <jmarton@no-mx.forums.novell.com>
Subject: What processor for a home VMware server?
Date: Sun, 02 Dec 2012 04:48:11 GMT
Message-ID: <f4Bus.4$IL5.3@kozak.provo.novell.com>
Lines: 7

I'm planning to have a new ESXi at home for just testing VMs and my
"home file & media" server. On new hardware, main aspect is low power
consumption, so I was wondering, if a box with internal disks or some
iSCSI capable NAS, that will power down the disks during idle times
(e.g. QNAP) would be the better choice.

Perhaps somebody has done this lately, pointing out recommendations and
pitfalls to avoid?

Tx, regards, Rudi.

PS: the old ESXi at home is a retired, reused old Proliant, consuming
faaaar to much power...