Is RAM upgrade worth it if I have an SSD already?
RAM still is a lot faster than any SSD which you use in your Mac. RAM has a shorter access times and much higher transfer rates:



[table]

The SATA interface by which the hard disk is connected limits the throughput to a theoretical maximum of 6Gbit/s (600MB/s) for SATA3.

You can determine how much the page outs are written to the disk by taking a look at the Activity Monitor. I try to keep the ratio at a maximum of 10/1 (page in/page out). The more page outs you have, the more like a RAM upgrade will benefit you.