trade the 2 1333 sticks for 2 1066, which is whats supposed to be in there
faster RAM *should* just clock itself down, but it doesnt always happen. i have seen numerous instances where people put 800Mhz RAM in older model macbooks and it works but at 533Mhz for some weird reason. i have also seen people thinking "itll just downclock" and put 800mhz RAM in 2007 vintage imacs that simply wont boot and beep, much like what you are experiencing
moral of the story is stick to whats supposed to be in your machine and you'll generally be fine
Yeah I guess I just may have to do that. I figured they would work since it's stated to be backwards compatible. My bad I'll try to sell then and if I can't I'll just leave it at 3GB then. She only uses her MacBook for word processing, Internet and music so she'll be ok.
iMac 21.6" 2.5Ghz i5, 8GB, 120GB OWC SSD, 500GB HDD
Apple TV (3rd Gen)
Lots of RAM threads here on ehMac dating back many years.
Common theme; buy from CanadaRam. They have the knowledge and go the extra mile to prevent these issues and make things right on those rare occasions when problems do arise.
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The reason why the new RAM is working with one of your original modules is that the original module is providing the correct timing information in its SPD (Serial Presence Detect data), so the Mac sets its memory speeds based on the Apple module (the slower module).
For whatever reason, although 1333 modules are "supposed" to be able to clock down gracefully, either the SPDs of the particular modules are not written 100% correctly, or the Mac is being extra persnickety about not reading the lower speed SPD values and using them. So when they are installed together, the new modules do not register with the Mac as valid memory speeds. Some models of Mac are just difficult this way.
CanadaRAM supplies RAM memory, drives and upgrades to Mac owners all over Canada http://www.canadaram.com