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Xeon E5-2670, with 115W TDP, which means 2x115=230W for the processor alone. with 8 ram modules @ ~3W each, it'll going to guzzle ~250W when under some loads, while screaming like a jet engine. Assuming $0.12/kwh, that's $262.8 per year for electricity alone.
Would be great if you have an isolated server room to contain the noise and cheap electricity, but more modern workstation should use at least 1/4 of electricity or even less.
I just want to correct something is that the TDP is the power under load, so if the cpu is not 100% used it could be 20 hours at 25W and 4 at 90W
Power scaling for these old CPU is not great though. Mine is slightly newer and on idle it still uses 50% of the TDP.