Facebook announces next-generation Open Rack frame

Re:Facebook announces next-generation Open Rack frame by baybal2 on Saturday March 16, 2019 @09:25PM (#19411576)

There are 90%+ efficient reasonably cheap flex psus, but the mainstream is around 80%.

So, you would not be saving much if you only have access to 110 or 220 mains.

The economy changes though if you can get access to industrial 3 phase linkup at 400V, and can avoid additional low step down transformers.

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Re:Facebook announces next-generation Open Rack frame by vanderZwan on Sunday March 17, 2019 @06:32AM (#19413306)

> So, you would not be saving much if you only have access to 110 or 220 mains.

"Much" is a relative term here, no? Like, doesn't that kind of depend at the scale at which Facebook operates?

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Re:Facebook announces next-generation Open Rack frame by detaro on Sunday March 17, 2019 @06:37AM (#19413323)

I read somewhere that part of it was also doing the short-term battery backup on a rack-level, without needing conversion back to mains AC and then again back to DC in the server for it.

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Re:Facebook announces next-generation Open Rack frame by bigbangchina on Sunday March 17, 2019 @06:53AM (#19413358)

You can use microwave oven transformer to step to 1000VDC then simply use step down converter in each rack.

I am doing this for my home lab with 100 servers.

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