Query failed: connection to localhost:9312 failed (errno=111, msg=Connection refused). is it okay to Mix pc4200 (522mhz) and 3200u 677mhz? - Genius Bar Discussions on AppleInsider Forums Toggle navigation All Forums Recent Posts Sign In is it okay to Mix pc4200 (522mhz) and 3200u 677mhz? imon4 Posted: January 9, 2007 2:37AM in Genius Bar edited January 2014 is it okay to Mix pc4200 (522mhz) and 3200u 677mhz?my mac is PM dual core 2.0 ghz, mac only reccommend the 4200, butsome people said its fine, no prob...etc, while some dont! Comments Reply 1 of 3 imon4 Posts: 22member January 9, 2007 9:11AM mmm i was wrong, 3200 is 400mhz...not 677...wich is actually 677 Reply 2 of 3 smax Posts: 361member January 9, 2007 3:49PM As long as they are both the same type (pin count) you can. BUT it will run at the slower speed, so there really is no point unless you plan on completely revamping your memory. Reply 3 of 3 imon4 Posts: 22member January 12, 2007 8:03PM how to count the pin ? im using umax Pc2 3200u right now...cuz my 533mhz kingston is damaged after i mixed them together....i already send the kingston memory back to apple anyway..guess i play it safe...and just use the 533mhz from apple reccomendation...^^ Sign In or Register to comment.