Dell C6145 mobo power element identification

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Jan 6, 2018
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Hello, some time before I bought a Dell C6145 mobo, and make a "custom" power system for it(simply connect it's power connector by wires to +12V line of 750W HP server PS), and it's worked good with 2 CPU's some time, but now every time I power it on, the 4 used DIMM on second CPU is disabled(it's message from bios), and second NB is very hot(50-60C after bootup). Now I discover, that some 6 pin element on the board, palced near the second NB and DIMM array of second CPU is absent on board, it's must be placed in middle of second NB and second CPU DIMM array, and same elements are on board is other places(like on same position according to first NB and first CPU DIMM array. Maybe, someone can help?
What I can install there to make board fully work?