1066mhz

Hi guys! I am running an early 2009 single CPU Mac Pro 4.1, successful updated with the 5.1 firmware. After the installation of a 6 core Xeon with 3.46Ghz and 4 x 8GB HYNX 1333Mhz ECC Ram, everything is running fine, except one minor issue : The rams are only recognized as 1066Mhz instead of...

Hello, I have late 2010 macbook pro, 2.4ghz 13' aluminum unibody. I want to upgrade my ram to 8Gb, but one slot is not working. Will single 8GB ram will work on one slot only? also, I hae cheked 4GB ram 1600mhz and didnot work, so should I use exactly 1066mhz pc3 8500 ? which is oficially...