The 405 G4's memory should run at 2400Mhz. I have 4 dimms of 16GB ram which is the maximum this unit can take.
If I install 16GB or 32GB of RAM (any of the four dimms) the memory runs at 2400MHz
If I insert all four of the dimms, the memory speed drops to 1866MHz
When I look at the HP Device Diagnostics it reports that all four dimms are 2400Mhz capable.
All four dimms are identical and are as specified in the 405 G4 manual. I think this may be a BIOS issue. The manual does not mention that memory operation is slower when fully populated.
I have tried chatting to a support rep online but go round in circles. Anyone got any thoughts as to how I can get this resolved?