That CPU runs RAM at 2400 MHz, so that's fine (anything faster will downclock). There is a 32G kit for the system (albeit 2666, but it'll run fine at 2400). [URL]  
I bought the above laptop several months ago on eBay. It currently has 2 x 8GB memory sticks, 1 is a Kingston and the other is a Hynix. I want to upgrade to 32GBs and I am not sure which Crucial memory to order. They show 2400 MTS, 2666 MTS and 3200 MTS with all being DDR4. Crucial's web site dosen't show any upgrade over a total of 16GBs for my laptop. The laptop has an i5 7300HQ processor. Which clock speed should I order?
Memory Upgrade for a Precision 3520 Laptop