Details
32GB (4 x 8GB) 1333MHz DDR3 SO-DIMM PC3-10600 204Pin SO-DIMM CL9 Memory RAM Upgrade Module Compatible with Mid 2010/2011 21.5" & 27" iMac Models (OWC1333DDR3S32S)

OWC 32.0GB UPGRADE: Consists of Four 8GB DDR3 1333MHz PC3-10600 CL9 SO-DIMMs 1.5V 204-pin Memory Module Compatible with iMac and PC
COMPATIBLE WITH: 27inch iMac Models: Mid 2011 iMac Model ID: iMac12,2 and Mid 2010 iMac Model ID: iMac11,3 2011 21.5inch iMac Model ID: iMac12,1 (Not compatible with 2010 iMac 11,3 i3 model)
100% COMPLIANT: With JEDEC Standard Specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed All MAC Specifications for iMac and PC Laptops
COMPATIBLE PART NUMBERS: 661-7022, UV661-7884 , 661-5859, CT8GS1339M.C16FND, CT102464BF150B.M16FED, CT2C8G3S1339M, KVR1333D3S9/8G, KTA-MB1333/8G, HMT41GA7MFR8A‐H9, M471B1G73BH0-CH9
INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost the Performance in Your Mac or PC
INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing
Product Specs: Technology: DDR3 SO-DIMM Density: 4 x 8GB (8192MB) RoHS: Yes Pin Count: 204-pin Op. Temp.: 0C to +85C Data Rate: DDR3-1333 Speed: PC3-10600 CL: CAS 9-9-9-24 Cycle Time: 1.875ns Voltage: 1.5V ECC: Non ECC Module Ranks: Dual Rank Register: Non Parity. Low Noise 8-Layer PCB Meets and/or Exceeds Apple/Intel Specifications. Fully Compliant with JEDEC specification. RoHS Certified Warranty Safe Upgrade. OWC Memory Lifetime Limited Warranty including the OWC Lifetime Advanced Replacement Program. Compatible with 27-inch iMac Models: Mid 2011 27 inch iMac Model ID: iMac12,2 (2.7GHz i5, 3.1GHz i5, 3.4GHz i7) and Mid 2010 27-inch iMac Model ID: iMac11,3 (2.8GHz, 2.93GHz, 3.2GHz, 3.6GHz); Compatible with 21.5 inch iMac Mid 2011 21.5-inch iMac Model ID: iMac12,1 (2.5GHz i5, 2.7GHz i5, 2.8GHz i7). Not compatible With Mid 2010 27-inch iMac Model ID: iMac11,3 (2.8GHz, 2.93GHz, 3.2GHz, 3.6GHz and Mid 2010 21.5-inch iMac Model ID: iMac11,2 (3.06GHz, 3.2GHz, 3.6GHz).