Olinuxino LIME external 5V DC source

[leniad]

Hello!
I've read the user manual, and it says several times that I shouldn't use more than 5v DC for the external source. However, I have 3 5v switching supplies in my possesion, and when I measure them without a load, two of them have 5.4v, and the third one has 5.1v. I haven't been able to find detailed information on the absolute maximum ratings of the board. Are my supplies safe, or should I find one that has strictly less than 5v?
Thanks for your time!

[MBR]

They are probably poorly stabilised (or they don't have any kind of stabilisation at all) and may behave unpredictable under heavy load. I don't recomend using them. Voltake 5.1V is still OK, but 5.4V not.