About 5yrs ago I had a pc built by Novatech, (quite expensive), NO PROBLEMS for 4yrs, then all sorts of unusual things, latest is RAM problems, mobo is gigabyte z170xp and ram is stated on both actual motherboard AND ALSO manual as being DDR4, yet DDR 2 is fitted in motherboard and is causing problems. I dont under stand how DDR2 can fit into DDr4 slots. Can anybody hwlp.. Tankyou!