for what it's worth I picked up a used HP DL360 gen9 server and it came with dual 80 platinum power supplies, 128gb DDR, and dual Xeon 2680v4 (28c/56t) processors... no HDD but the cost was $150... I actually got the the server with for $100 and I then I got a pair of used processors of ebay for an extra $50...
with a few SAS cables and my 4tb drives from my old server... I migrated everything over to this server running proxmox and I'm hitting 150w average which is less than my previous bare metal devices.
It might not work for everyone, but I'm glad I decided to make the jump to enterprise hardware as I was looking for reliability and reducing my power load overall.
today my dual E5-2680v4 processors arrived. I installed them with fresh thermal paste and at boot my system idled at 80w... that was according to iLO and a smart power monitor plug that monitors everything plugged into that outlet.
after 5 minutes of run time with 5 - VMs currently running I'm sitting at 120w as a high and 100w average.
My current setup is a DL360 Gen9 with 128gb DDR4. 2 x E5 - 2680 V4 that just replaced my pair of 2637 v3 I should note I don't have any spinning drives installed, only 5 x 128mb sata SSD. I also have an extra 4 port 1gbs PCI card installed and I added p440ar since my server didn't come with a SAS card only the built in sata controller.
Once my slightly longer SAS cables arrive so I can connect the p440ar I'll eventually be at 8x2.5" SAS, 4xsata SSD, 8x3.5" SAS and 4x2.5" sata.
But here we are today running idle at about 100w in my gen9 with a peak of 120w under load.