Thanks Daniel, my all doubts are clear now...except this last one...
This Servers already had 32GB mem..with 8pcs of (G484D) -MEMORY MODULE..4G, 1066, 2RX4X72
You said along with 16GB modules, I can also use this 4GB 1066 module at both bank A and B at 7th, 8th slot...but I was going through User guide which says...All the channels in all Bank must be populated with same size and config of memory. have I missed anything in the guide..
thanks.