If it is just a small home server, Go for a HP Microserver G8. It performs good enough for your needs and it will not drain your electricity bill.
The Dell T61 probably will use between 200 and 300W (depending on the amount of disks you use, each disk roughly adds 20W)
So still, my advise would be: don’t use that kind of “enterprise grade” servers at home. (sidenote: If the server is not in the basement you will hear the fan’s. Those servers are LOUD.
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