its possible to use in R520 models or R720 models with memorys 2rx4 e 4rx4?
Dual Rank (2Rx4) and Quad Rank (4Rx4) memory modules can be mixed.
For exemple: have 8 modules of 16G 2rx4 and 2 modules 32G 4rx4 on same server?
Equal number of Quad Rank and Dual Rank memory modules ought to be used in order to keep the memory channels balanced. Note that the Quad Rank modules should be populated on slots with white sleeves followed by other rank DIMMs. For more information, see pages 41 - 45 of the Users' Guide: http://topics-cdn.dell.com/pdf/poweredge-r520_Owner's%20Manual_en-us.pdf