[CentOS] Power-outage

Colin Coles wrote:
> On Friday 01 July 2011 12:05, Timothy Murphy wrote:
>>
>> Any advice or suggestions gratefully received.
>
> If you are thinking of the UPS route a caveat: I have several HP servers and
> most of them will not work on cheap UPS's as they do not produce the pure
> sine wave modern HP machines require but rather a crude stepped voltage.

perhaps naively, I'm surprised: doesn't this mean they put crappy PSUs 
in those servers?
I thought decent PSUs were expected to deal with dirty input AC?