Mix RAM modules on T5500- single CPU

Hello,

My T5500 (D883F, Bios A02, xeon E5520 ) has 3x4 Gb RAM modules (4Gb 2Rx8 PC3 10600R-09-10-B0-D2).

Is it possible to add 3 modules 4Gb 2Rx4 PC3-10600R-09-10-E1-D2 safely ?