Hi there,
I wanted to upgrade the RAM of my old Mac Pro 3,1 - 2x4 Quad Intel Xeon (Early 2008) up to 64GB of RAM. At this moment, I have 10GB of 800Mhz Kingston RAM installed and with El Capitan 10.11.6 and Adobe CC. It's definitely to slow now.
I'm not sure, if I should go for 8x8GB 800Mhz...