Dear all After the 10.12 just release the GM and i'm try to all the way to install the 10.12 in my cMP3.1, may be I'm not strong enough, still can't success. Than I'm looking the second hand market in Hong Kong, I'm just found out one of 09 cMP ( should be 4.1) with 8GB ram and GT120, it just cost USD488, do you thing this cMP can upgrade to 5.1 by Mac Pro 2009-2010 Firmware Tool and replace the CPU to X5670? Because I'm living in Hong Kong so I'm can easy to found the parts in Taobao. 1: 4GB DDR3 133 Ecc ram in Taobao around USD4 but may I know which brand is much match : Crucial, Hynix, Samsung..... 2: About the CPU upgrade can i use the SLBV X5670? Thanks all your help.