I have this question too and I'm struggling to get an answer, mt friend recommend an online technical support to help me out but I'm a little hesitant.
Anyway, here's a forum I've found. hope this will help
Hmm, Not sure I like this Boardreader.com copy off the Intel forums and not even providing credits or links to the sources.
As fas as technical assistance I would recommend http://www.intel.com/support/feedback.htm?iid=subhdr+res_contact
since this is a Intel Server I would ask the Intel support (or post in this forum, or both)
The Memory Controller hub is integrated within the CPU so in order to use both groups of memory, you need 2 CPUs. Any core can then access memory from any bank.
Max memory is 16G DIMMS X 12 = 192G (see http://www.intel.com/support/motherboards/server/s5520ur/sb/CS-030026.htm for supported memory)
188.8.131.52 Supported Memory
The Intel ® Server Board S5520UR, S5520URT supports six DDR3 memory channels (three per processor socket) with two DIMMs per channel, thereby supporting up to 12 DIMMs with dual-processor sockets with a maximum memory capacity of 192 GB.
Product TPS may give you addtional helpful information http://download.intel.com/support/motherboards/server/s5520ur/sb/e44031011_s5520ur_s5520urt_tps_r1_8.pdf
The OS you are using may limit the amount of available memory.
As a rule, 32 bit OSes can only access up to 4 G of memory
So as far as a limit to the 6 slots 6 * 16 G = 96G.
Never heard of the SIW software. Looks very simular to the Intel System Information Tool