I bought a second hand hp dl160 g6 a year ago with 48GB configured in it. I discovered checking with cpu-z and doublechecked with speccy the memory runs at only 533Mhz. I checked the configuration with the HP memory configurator and the banks are populated correctly for max performance. There are 12 banks populated with micron and hynix memory of 4gb, all capable of running 1333mhz. What could me wrong here?

 C:\Users\Administrator>wmic Memorychip get manufacturer, partnumber, speed, seri
alnumber, devicelocator, banklabel
BankLabel  DeviceLocator   Manufacturer  PartNumber         SerialNumber  Speed

BANK0      PROC 1 DIMM 3A  Micron        36JSZF51272PZ1G4F  C5DF65D7      1333

BANK1      PROC 1 DIMM 2D  Micron        36JSZF51272PY1G4D  951565E0      1333

BANK3      PROC 1 DIMM 6B  Micron        36JSZF51272PZ1G4F  3F3160D6      1333

BANK4      PROC 1 DIMM 5E  Hyundai       HMT151R7BFR4C-H9   E28A3014      1333

BANK6      PROC 1 DIMM 9C  Micron        36JSZF51272PZ1G4F  26DF7E1A      1333

BANK7      PROC 1 DIMM 8F  Micron        36JSZF51272PZ1G4G  77FC67D7      1333

BANK9      PROC 2 DIMM 3A  Hyundai       HMT151R7BFR4C-H9   FB763433      1333

BANK10     PROC 2 DIMM 2D  Hyundai       HMT151R7BFR4C-H9   E18AA014      1333

BANK12     PROC 2 DIMM 6B  Hyundai       HMT151R7BFR4C-H9   DF8A1014      1333

BANK13     PROC 2 DIMM 5E  Hyundai       HMT151R7BFR4C-H9   6968511A      1333

BANK15     PROC 2 DIMM 9C  Hyundai       HMT151R7BFR4C-H9   F28A7014      1333

BANK16     PROC 2 DIMM 8F  Micron        36JSZF51272PZ1G4G  76FC67D7      1333