Actual product may differ slightly in appearance.
OWC Memory Upgrades For 27" & 21.5" iMac (Late 2009)
32GB
Up to 32GB memory1
Works with the following Model IDs
- iMac11,1
- iMac10,1
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Rigorously in-house lab tested
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Easy DIY install videos
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OWC MaxRAM Certification
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Lifetime advanced replacement warranty
OWC Memory
- This Mac has four available memory slots.
- Install in pairs for best performance.
- All installed memory should be the same speed for best performance.
- Backed by an OWC Limited Lifetime Warranty.
Buying Options
1066MHz DDR3 PC3-8500 -- Maximum 32GB supported1
Install Videos
Our step-by-step installation videos guide you through upgrading your Mac, iPhone, iPad or iPod.
View all Install Videos »
- 27-inch iMac models (iMac11,1 and iMac 10,1) support up to 32GB total memory (maximum 8GB per slot). 21.5-inch iMac models (iMac10,1) only support up to 16GB total memory (maximum 4GB per slot).