Hitachi Advanced Server HA820 G2 User Guide  25 
Item  Description  Example 
2  Rank  1R = Single rank 
2R =  
Dual  
rank 4R  
= Quad  
rank 8R  
= Octal 
rank 
3  Data width on DRAM  x4 = 4-bit 
x8 = 8-bit 
4  Memory generation  PC4 = DDR4 
5  Maximum memory 
speed 
3200 MT/s 
6  CAS latency  AA = CAS 22-22-22 
AA = CAS 26-22-22 (for 3DS LRDIMM) 
7  DIMM type  R = RDIMM (registered) 
L = LRDIMM (load reduced) 
Intel 
Optane
 persistent memory 200 series for label identification