IMRANSFPL,     If you are certain on the dimm count, then the only option would be to have the dimms in slots A1, A2, A4, and A5 then B1, B2, B4, and B5, as seen on page 132 here.    Let me know if this helps.    
HI,   I HAVE 8 STICKS OF 4GB, UPON CLEANING OF PC I FORGOT THE CORRECT PATTERN TO INSTALL MEMORY, CAN ANYONE HELP HOW TO CINFIGURE MEMORY SLOT OF DUAL PROCESSOR R710, REMEBER 8 STICKS OF 4 GB EACH.   THANKS.  
DELL R710 MEMORY CONFIG