Upgrade the memory in select 2009-2010 Mac Pro systems or compatible PCs using the OWC 8GB DDR3 1066MHz DIMM Memory Kit for Macfrom OWC / Other World Computing. This memory kit features a total capacity of 8GB, which is made up of two 4GB modules. It features a clock speed of 1066 MHz, a bus speed of PC-8500, and a 240-pin DIMM form factor. It operates using 1.5V, 7-7-7-20 timings, 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.

8GB (2 x 4GB) Capacity    1066 MHz Clock Speed    PC-8500    240-Pin DIMM    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. 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: 2. 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: 3. 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: 4. 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: 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. Can this memory work in an acer aspire7741 ? (windows)

A: It appears that your Aspire requires 1600MHz memory, this would not be appropriate.You would need OWC1600DDR3S08S.

Q: 7. can I install this on imac 27in late 2009?

A: sorry it is everymac dot com

Q: 8. Will this work on the 5K iMac 2017?

A: No this would not, I would suggest the following https://bhpho.to/31rt48z for the iMac 27" (5K) 2017 model

Q: 9. There seems to be some doubt whether or not the 64GB (4 X 16 GB) would be readable by a iMac 5K 27 Late '13 model, but upgraded to current operating standards. From what I've read so far, it looks like it will only read up to 32GB of memory. Will it see all 64 or just utilize the 32GB that it says it can be upgraded to? Much confusion here! Don't want to make a $829 mistake here...

A: I'm sorry, but the 2013 iMac tops out at 32GB's of RAM.

Q: 10. Is this compatible with Mac Pro mid 2012 with 3 1066 2GB installed and one empty slot. I want to raise the RAM to 32GB. If this does not work what RAM do you reccomend?

A: This memory will not work in a Mac Pro. This is memory for an iMac or Macbook Pro. You need the OWC1333D3X9M032. However, this memory will require you to remove the existing Apple memory.