In my current system, I have 2x4GB SODIMM CL11 3200MHz 1x16, one is soldered and one is upgradeable. I'm planning to upgrade with an 8GB stick. But I can't find CL11 in my country. Every 8GB (3200MHz) stick is CL22. So my question is, can I mix these together? Also upgrading will be in the official service.