Can mid 2011 mac ini use 1333 memory speed
Can mid 2011 mac mini be upgraded to 8 gig of ram using two 4 gig 1333 memory?
Yes, see > Mac mini (Mid 2011): Memory specifications and upgrades - Apple Support
Just keep in mind that Apple systems are picky and it is best to buy from vendors like macsales or Crucial that specializes in Mac memory.