Power supply for MSI 645 Ultra mother board

I need to replace the power supply for a MSI 645 Ultra mother board. I've available a switching power supply Allied model DR-B500E, that doesn't have the -5V output (infact its 20 pin ATX power supply connector has no wire in pin 18).
Can I use this power supply with the MSI 645 Ultra?
Thanks in advance for any help.

Hi, here I am. Sorry for delay but I had some problems with the PC (as NTLDR missing).
However now is ok and I can confirm that it runs ok also with power supply without -5V output.
Thanks a lot for the support and best wishes for Christmas and new year.

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