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RAM for Apple iMac (Late 2009 (21.5-inch))

Model Years: –2009

Max RAM: 2010GBRAM Slots: 16RAM Type: 4
✓ RAM Upgradeable

Quick answer

Our data matches the Apple iMac (Late 2009 (21.5-inch)) with 1066 (4, 4, 0GB).

Supported memory profile: 4, 4, up to 2010GB max, 16 slots.

Before buying, confirm your exact model number, memory generation, form factor (4), speed, and maximum supported capacity. Live eBay listings are shown below and may change.

Compatible RAM for the Apple iMac (Late 2009

Listings and prices are pulled from eBay and may change. Always verify compatibility before purchase. Listings are updated daily.

Frequently Asked Questions

What RAM fits the Apple iMac (Late 2009 (21.5-inch))?

Based on our compatibility data, the Apple iMac (Late 2009 (21.5-inch)) supports 4, 4, up to 2010GB max, 16 slots. Matched modules include 1066 (4, 4, 0GB). Always confirm your exact model number before purchasing.

How do I verify RAM compatibility?

Check that your device label or manual shows 21.5-inch) (or iMac (Late 2009). Confirm memory generation, form factor (4), speed, slot count, and maximum supported capacity match the specs on this page before ordering.

Can I mix RAM speeds or capacities?

Many systems run best with matched pairs (same capacity and speed). Mixing capacities or speeds may work but can force lower speeds or single-channel mode — check your OEM documentation.

Are these listings live and current?

Current eBay listings for compatible RAM modules are shown below. Prices and availability change frequently — verify listing details and seller ratings before you buy.

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.