OWC 64GB DDR3 1066 MHz RDIMM Memory Kit (4 x 16GB, Mac)

Key Features 64GB (4 x 16GB) Capacity 1066 MHz Clock Speed PC-8500 240-Pin RDIMM 1.5V 7-7-7-20 Timings ECC, Registered Apple Thermal Sensor Compatible Module Bandwidth: 8.5 GB/s Compatible with Select Mac ProsUpgrade the memory in select 2009-2010 Mac Pro systems or compatible PC desktops and servers using the 64GB DDR3 1066 MHz RDIMM Memory Kit from OWC / Other World Computing. This memory kit features a total capacity of 64GB, which is made up of four 16GB 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, 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. This RAM is also registered/buffered. Additionally, this memory module is compatible with Apple Specified Thermal Sensor, which ensures that the RAM maintains a safe thermal operating range. This kit is compatible with dual-processor (Eight-Core) Mac Pro models ONLY. While single processor (Quad-Core) Mac Pro models do have four memory slots available, this kit is not compatible with them due to an OS system limitation. 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. 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.