1066
Crucial 4GB DDR3-1066 SODIMM
40GB4
RAM for Apple iMac (Late 2009 (21.5-inch))
Model Years: –2009
Max RAM: 2010GBRAM Slots: 16RAM Type: 4
✓ RAM Upgradeable
Compatible RAM for the Apple iMac (Late 2009
MEDIUM
RAM Upgrade Guide for the Apple iMac (Late 2009
This device uses 4. Maximum supported capacity is 2010GB.
Always power off and unplug your device before installing RAM. Ground yourself to avoid static discharge.