"Should clock down to 2400mhz but not gauranteed to be compatable."
Be careful - that's what I thought when I put 32GB of 3200 DDR4 RAM (which was advertised as being compatible with 2950 and 2666) in my son's laptop which turned out to have an intel processor from a generation designed for 2666 DDR4 .... the laptop insisted on chosing the 3200 speed and while all seemed intially ok (windows booted!) he had lots of crashes when he got back to Uni and started stressing the system with audio-production software .... when he made an emergency trip home for me to sort it out memtest86 immediately showed RAM problems (like in about 30 seconds) but when I'd swapped out the 3200 DDR4 and replaced it with 2666 DDR4 it was all fine (and fortunately the place I'd bought the inital set from fave me a refund without any issue). Also, the laptop BIOS was heavily locked down so there was no way in the BIOS to even see what the RAM speed was let alone tweak any settings!