Downwards compatible. Can be used as 8500R/1066MHz RAM.
2009-2013 Nehalem Mac Pro memory 32GB 4X 8GB DDR3-1066 PC3-8500 MacPro 4,1 5,1
Matched Pair (2 CPUs) Intel Xeon X5690 6 Core 3.46GHz Mac Pro 5,1 upgrade kit
Mac Pro 2019 SSD upgrade Kit 2TB brand new
SIX Core Apple Mac Pro 2009,2010,2012 CPU Upgrade kit X5690 3.46GHz 4,1 5,1
New Sealed OEM Apple Memory Upgrade Kit 32GB (2x16GB) for 2018 Mac Mini A1993
16GB Kit [8x2GB] Memory RAM Upgrade for the Apple Power Mac G5 (Quad 2.5GHz)
![16GB Kit [8x2GB] Memory RAM Upgrade for the Apple Power Mac G5 (Quad 2.5GHz)](/images/thumb.php?i=24926690&s=195)