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Between 1100 and 1200Wh. DL580 is using about 700Wh, Dl360e about 200Wh, and R610 about 250Wh. The power usage fluctuate a bit due to temperature and usage, but is around that value. In the future I plan to make a DIY metered PDU. To be able to monitor the power usage of every server. I plan on using it to also detect issues in workflow by monitoring the power usage.

Oh, that's quiet a lot... I thought about looking out for used servers as well, but I cant affort that amount of additional electricity unfortunately. Well, and I also do not have the space 😅

Well, best bet is to go with newer ones. For example:
Dell R610 (equivalent gen 7) has 2x 4 ocre/8threads CPU and uses 250Wh
HP DL360 gen 8 has 2x 8 core/16 threads CPU and uses 200Wh
HP DL580 gen 7 has 4x 8 core/16 threads CPU and uses 700Wh

As you can see, the gen8 HP has double the core count as Dell and a power usage lower than it.
About the space, there are many ways. If you want just one or 2 servers, you do not need a rack. There are wall mounted supports and it can be wall mounted.

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