"Can I have 5 sticks for CPU 1 and 4 sticks for CPU 2?" No, CPU's must be populated identically. [URL] [URL]   
DELL PE R610 If i have 9 sticks of RAM  (8GB) w/ 2 CPU  Can I have 5 sticks for CPU 1 and 4 sticks for CPU 2?  Or will it only work in equal amounts of RAM for each CPU?
RAM Config question