DELL PowerEdge T310 4 x 8GB 1333mhz Memory not usable

Hi there,

I own a T310 with Xeon E3450, with 4 x 4GB 1333mhz RDIMM

i bought 4 x 8GB 1333mhz RDIMM and the system doesn-t start, it says that the memory installed is not usable, check DIMM configuration

pleasee don-t tell me that 8GB 1333mhz RDIMMs are not supported, because the manual doesn-t say anything about that

the DIMM configuration that i set up was quad rank, 1-2-3-4 slots used, with 5 and 6 not occupied

thanks.