Upgrade the memory in select 2009-2010 Mac Pro systems or compatible PC desktops and servers using the OWC 48GB DDR3 1066MHz UDIMM Memory Kit for Macfrom OWC / Other World Computing. This memory kit features a total capacity of 48GB, which is made up of three 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 1024M 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.

To utilize over 32GB of memory in your Mac Pro using 10.6.x or greater, you must boot into 64-bit mode. In 32-bit mode, all installed memory will show in system profiler, but only up to 32GB will be actively used by the computer.

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.

48GB (3 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

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

Related Questions and Answers

Q: 1. Hi, can this memory work in a Acer Aspire 5740-5749? (windows).The specification say memory for mac..

A: We specifically build our memory for Mac's, but most of the time it does work on PC's. The memory complies with JEDEC specifications, but there are far too many variables involved to tell you for certain.

Q: 2. will these work in a Mac Pro mid-2012 5.1 6-core machine?

A: If your Mid 2012 Mac Pro shipped with 1333Hz RAM it will be fully compatible with the computer. Note that some Mid 2012 models shipped with 1066MHz RAM. You can verify which your system uses by opening the System Information application in the Utilities folder.

Q: 3. Do you have any internal SSD's that will suit a hard drive upgrade for a MacBook Pro Mid 2010, model identifier 7,1? Many thanks

A: The Mercury Electra 3G SSD would be suitable.

Q: 4. Is this RAM compatible with this specifications?- PC3-10600E, 1333 MHz, DDR3 SDRAM UDIMMs and RDIMMs- Error-correcting code (ECC)- 72-bit wide, 240-pin ECC modules- 36 ICs maximum per ECC UDIMMIt's a mid 2012 12 core MACPROThanks

A: I put mine into a 2010 MacPro and it works perfectly

Q: 5. Are these actually UDIMM? OWC's website shows them as Registered (aka RDIMM)

A: These are RDIMM's.

Q: 6. 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.

Q: 7. Can this be used on an imac 5K 2016?

A: Sorry, no. This memory is for the 2013 Mac Pro.

Q: 8. Can I use those OWC in addition to my Mac Pros (12 core mid 2012) original Hynix modules?

A: I can tell you that those dimm work fine in your mac, but I don' t know if you can mix with others . In fact I had incompatibility problems with other dimm ( not The original).

Q: 9. Does this work for a mid 2011 27 iMac 3.1Ghz Intel Core i5?

A: No, this should be the correct memory for a 27 Mid-2011 (iMac 12,2).a href= https://www.bhphotovideo.com/c/product/1212947-REG/owc_other_world_computing_owc1333ddr3s32s_32gb_4_x_8gb.html target= _blank https://www.bhphotovideo.com/c/product/1212947-REG/owc_other_world_computing_owc1333ddr3s32s_32gb_4_x_8gb.html/a

Q: 10. will these work in a Mac Pro mid-2010 - 2 x 2,4 GHz Quad-Core Intel Xeon ?

A: Hi, is that workin with macPro 5.1 ?