I picked up 3 Dell CS24-SC Servers off eBay for ~$150. They have 8 Cores, 16 GB DDR2, and 4x15k SAS RAID. The fans don't always run at full speed, so I don't notice how much noise they make, but they're in my mechanical room in the basement where the HVAC fan makes a lot more noise.
The IPMI BMC listens on port 81. The draws about 8W @120V when the main system is powered off. That would cost me $10.13/year at $0.1445/kwh
I made a USB stick to boot the ESX installer. I had to type install at the boot prompt. Then to install ESX it is necessary to boot with the option ignoreHeadless=TRUE
When ESX boots after the install, the same option has to be given. And to make the option permanent, from the ESX command line, run esxcfg-advcfg --set-kernel "TRUE" ignoreHeadless
Running ESXi 5.5.0u1 idle, the server uses 160W. For a year that costs $202.53 in power.
I also got an 8-port KVM switch which works great. It draws 2W.
Leaving that plugged in 24/7 for a year would cost me $2.53 in power
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