Will these speakers work on 27" iMac?

hi

being should take delivery of imac tomorrow or saturday @ latest,have logitech z523 2.1 speakers,while knowing little macs,will these speakers work ok,also on coming weeks wish upgrade 16gb ram,how know if im buying right ram?

cheers

 

they use standard 3.5mm audio cable work. ram, need ddr3 1333mhz so-dimms.

 

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