I'd like to have 24 GB of ram. I tried and it worked for 20 minutes or so and it started crashing, I've then updated BIOS and it would not work afterwards (it would not POST)? SIzes only differ here *(Kingston 8GB 2666 MHz DDR4, KVR26N19S8/8 CL=19 - Kingston 4GB 2666 MHz DDR4, KVR26N19S6/4 CL=19), Can I have stable machine with usable RAM?