i found that the slots not the same with dimm ram so what? fb dimm ram works only at mac?
FB-DIMM is not compatible with your motherboard, you know the reason why. The memory is notched differently from conventional 240-pin DDR2 (check the image below). Moreover, it uses a different technology compared to normal memory and it supports ECC function as well.
There are many other systems that use FBDIMM memory (Fully Buffered memory) but mainly I have seen them being used in servers or workstations using "Xeon 5000/5100 series and beyond".