Hello friends, I am using workstation, which has Intel s5520sc board two Xeon 5570 CPUs and also have 48 GB (6 x 8GB Dimms) Samsung DDR3 ECC REG Ram. It was working fine, and then I decided to change the graphic card. When I open the CPU to change the graphic card, I saw that there are Dimms which are installed as Cpu 1 (A2 / A1 / B2) and Cpu 2 (F1 / F2/ E1). So for changing the graphic card, I decided to change the Dimms from the first slot of each channel (A1, B1 C1 for CPU 1 and D1, E1 and F1 for CPU 2). After that when I started my workstation, in the BIOS it was indicating only 40GB available, and under the configuration of the memory. It was indicating that C1 slot fails. Is there any problem with my motherboard or it have any other problem now?