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Nov 3, 2015 10:44 AM in response to bigredneedle26by John0001,This shouldn't be a problem for you. Yes, keep it at 1333Mhz
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by rkaufmann87,Nov 3, 2015 10:49 AM in response to bigredneedle26
rkaufmann87
Nov 3, 2015 10:49 AM
in response to bigredneedle26
Level 9 (58,746 points)
Photos for MacUpgrading RAM on 27" iMacs is incredibly simple. Purchase the RAM from either Crucial or OWC (www.macsales.com). The reason for those two vendors is iMacs are sensitive to RAM and you want to use high quality RAM. Both vendors are reliable, will sell you the right product the first time and have lifetime guarantees of their RAM.
OWC even has instructional videos on how to install it. Here is a link to OWC's RAM for your iMac OWC RAM
Here is a link to OWC's RAM install video for your machine OWC RAM Install Video