Upgrade the memory in select 2009-2010 Mac Pro computers or compatible XServe and PC systems using the 32GB DDR3 1066 MHz UDIMM Memory Kit from OWC / Other World Computing. This memory kit features a total capacity of 32GB, which is made up of two 16GB modules. It features a clock speed of 1066 MHz, a bus speed of PC-8500, and a 240-pin UDIMM form factor. It operates using 1.5V, 7-7-7-20 timings, a component configuration of 2048M x 72, and a module bandwidth of 8.5 GB/s. By offering ECC (Error Checking and Correcting) technology, this RAM will help your workstation encounter fewer errors that can corrupt data sets and introduce system issues. Additionally, this memory module is compatible with Apple Specified Thermal Sensor, which ensures that the RAM maintains a safe thermal operating range.

Note: All installed RAM modules must be of the same type. Other existing Apple or 3rd-party modules are not supported for use with this kit and need to be removed when these modules are added.

32GB (2 x 16GB) Capacity    1066 MHz Clock Speed    PC-8500    240-pin UDIMM    1.5V    7-7-7-20 Timings    ECC    Apple Thermal Sensor Compatible    Module Bandwidth: 8.5 GB/s    Compatible with Select Mac Pros

Model ID: MacPro4,1

Quad-Core: 2.66 GHz, 2.93 GHz, 3.33 GHz

Eight-Core: 2.26 GHz, 2.66 GHz, 2.93 GHz

Model ID: MacPro5,1

Quad-Core: 2.8 GHz, 3.2 GHz, 3.33 GHz

Eight-Core: 2.4 GHz

Model ID: Xserve3,1

Quad-Core: 2.26 GHz

Eight-Core: 2.26 GHz, 2.66 GHz, 2.93 GHz

Compatible with Intel / AMD-based PCs capable with the specifications listed above. Memory complies with JEDEC Specifications, document JESD79-3B

Related Questions and Answers

Q: 1. My 27" late 2015 Mac OS has room for two 8GB memory modules. Cheaper to buy one 16GB. Can I use one 16GB instead of 2 8GB?

A: Yes you can. The system works best when its in pairs, so if you plan on adding another card it should be a 16GB not a smaller or larger size.

Q: 2. Will these Mac kits work in a PC desktop with the same number of pins?

A: As these chips contain specific features for Apple compatibility, such as Apple Specified Thermal Sensor. This may or may not prevent the chip from working in a PC.

Q: 3. This is not an ECC type, but will it work on MacPro late 2013?

A: This memory is ECC memory and is made for the 2013 Mac Pro, but it is Registered memory which cannot be mixed with non-Registered modules.

Q: 4. is this overclockable to 2133 or 2100mhz ?

A: The manufacturer has not published any information about overclock potential other than the following: XMP 1.3 support for automatic overclocking

Q: 5. Will this work in a Asus M5A78L-M/USB3 Motherboard?

A: From the limited specifications I can find on that motherboard, I believe the memory will work, but I cannot make any guarantee, as we have not tested this RAM with that motherboard.

Q: 6. the i7 iMac 5k is it compatilble with 64GB ?? because the apple website says that Max is 32GB

A: Yes, this is compatible with the iMac.

Q: 7. I'd like to use these in a late 2012 mac mini (6,1). Will they work?

A: Yes, the OWC 16GB DDR3 1333 MHz SODIMM Memory Kit (2 x 8GB, Mac) would be compatible with the Mac mini (6,1).

Q: 8. Can the 2 16GB modules be installed on an early 2009 24 inch iMac ?

A: Locate the Apple model number A.... And refer to the OWC website. Apple devices are very picky about memory specification. OWC has all tools on the website to check compatibility.

Q: 9. is this compatible with the newest Intel i9 3.6GHz iMac 27" (2019)?

A: This ram is not compatible with the latest iMac (Early 2019) model. The compatible ram will be BH #OW2666D4S32P.

Q: 10. Will this work with the MacPro5,1 that has one Quad-Core Intel Xeon 2.66 GHz processor ?

A: This kit should work with all Quad and Eight core Mac Pro 5,1's.