Is that what he's asking, the mono, "beep" diagnostic speaker? That will make the question strange 'cuz without that, there would be no way for the Mobo to send out diagnostic codes "beeps." I say it BETTER have (support) one.
I'd say most modern CONSUMER motherboards have support both for a diagnostic speaker - to hear the 'beep' codes after POST - AND stereo audio of some sort.
Commercial or industrial grade motherboards are probably probably a lot less likely to provide on-board audio, although even they would find it worthwhile to provide a way to hear POST diagnostic beep codes. You don't generally find these boards in the average computer shop though.
Yeah I wanted to clarify that I meant to say PC Speaker(Singular) the one for BIOS beeps,and as Rouge said I have noot seen one of those in a system from 2013 onwards really.Sorry for all the confusion i caused.
And i mostly wanted the PC speaker for DOS sound support as most of my older games create sounds only through a PC speaker.