Z240 (fall 2016 model) supports LRDIMMs (according to specs). I tried inserting 4 dimms, type: Samsung m393a2g40db1-crc
Info here about the memory: https://www.compuram.biz/memory_module,m393a2g40db1-crc,samsung.htm
But when booting the machine all I got was beeping. So what's the problem?