Data center Power

We are looking at a few colo data centers and one is running 30a 120v to the cabinet and another is 30a 220v.  The latter is telling the 220v is better for servers, SANs, etc.  I've never heard of this.  My data center has 220 but we kick it down to 110 for delivery to the equipment via various UPS'.

My questions are:

Is there some reason(s) 220 is better then 120 for servers and other equipment?
Are there any other reasons to pick 220 over 120?


There's a significant price difference per month and this is not an area I feel I'm that versed in.  Any and all advice is a appreciated.  

Thanks
Brian_BAsked:
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LazarusCommented:
This should explain it pretty well for you: http://voices.yahoo.com/is-208-volt-power-supply-better-data-centers-4240473.html

But yes a Data Center would prefer to use 220v or 208v vs 120v. Its a cheaper for the conduit cost but slightly more at the panels but overall a more efficient infrastructure.
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andyalderCommented:
220V is more efficient for the co-lo but as far as you the customer is concerned it doesn't make any difference normally since your PSUs are probably auto-ranging and will run on whatever they're supplied with.

You can even run a dual/redundant PSU server with one PSU plugged into 110V and the other on 220V as I tested a while ago with a step-down transformer.

IMHO 208V should be avoided since it's tapping from two live wires from a 3phase connector and pretending one of them is ground. It's fairly common where there's only low voltage 3phase supply available though but I wouldn't design a power supply to be at its peak efficiency at that setting.

As per previous post it's cheaper for the conduit to use higher voltage but the DC supplies that so not your problem.
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andyalderCommented:
Missed the bit where you said they supply 220V and then you step it down to 110V, that's just daft. You pay to buy a stepdown transformer or special UPS  and you pay for thicker mains leads for no reason except that 110V bites less than 220V if you do a wet tongue test on bare wires.
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