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Upgrade the memory in select 2009-2010 Mac Pro systems using the 8GB DDR3 1066 MHz UDIMM Memory Module from OWC / Other World Computing. This single memory chip features a total capacity of 8GB, a clock speed of 1066 MHz, a bus speed of PC3-8500, and a 240-pin UDIMM form factor. It operates using 1.5V, has 7-7-7-20 timings, a component configuration of 1024M x 72, a module bandwidth of 8.5 GB/s, and is equipped with ECC technology. 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 equipped with an Apple Specified Thermal Sensor, which ensures that the RAM maintains a safe thermal operating range.