I have 16GB DDR3 1600 MHz CL9 RAM (8GBx2) in my computer. The motherboard is MSI Z97 PC Mate that supports up to 32GB. My CPU is i5 4590. I built this dude in 2016 and its still going great. I do very CPU/RAM intensive work and I need to upgrade my RAM from 16GB to 32 GB.

My only issue is that I find it almost impossible to find a CL9 DDR3 RAM. I can find CL11 easy but I just cannot find two 8gb sticks of CL9 DDR3 RAM that is 1600MHz. I can also find CL9 DDR3 1333 MHz, just not 1600 MHz. My understanding is that I cannot mix CL9 with CL11 otherwise I won't be able enable XMP and all 4 modules will run at 1333 MHz.

Should I buy a pair of 8GB DDR3 1600 MHz CL11 sticks and mix them with the other two that are CL9? Will I still be able to run them all at 1600MHz with XMP?

Thanks!!!