翻說明書可以看到 (8rda+)
In three DIMM memory configuration,the DIMMs cn be located on all DIMM sockets in 128-bit mode.

所以插3條是可以跑128bit的.
只是沒特別說到是不是一定要同規格...
不同規格的話..插法不同會不會影響到能不能開啟...
還是都可以..還是要看RAM本身的體質...

當然下一段有提到...
Using non-compliant memory with higher bus speeds may severely compromise the integrity of the syetem