@ccwtech hello I know it’s been years but if anyone ever wants the answer to this question...
The T410 is a tri channel board with Dimms have white and black sides in the Dimm slots
A 1,2,3 plus 4
B 1,2,3 plus 4
The first three on A or B cpu must be filled in order with identical types of Ram. The 4th can be different size but not frequency... But if you try to do a 4gb in slot one it will try to give errors if you skip slot two ORRRR you put in 8Gb to slot 2 and 3.
Filling slot four isn’t necessary but can maximize Ram, and the dimms for dual cpus need to be put in the same order. Single cpu you can get away with flex but if you use dual put the same size Ram and frequency in the same A1 and B1 slots as well as the rules above dealing with trichannel dealing with the rest of the slots for A and B.
Dimms Slots 1,2,3 in both CPU will have white tabs on the Ram slots while slot 4 will have black locking tabs. This is the Ram channel you won’t use unless you have filled the rest of both CPU channels. So basically if cpu 1 has two Ram cards then cpu 2 needs two of the same type as cpu 1 in the same slots. If you do have Ram in slots 1 & 3 then from what I’ve read it will ignore slot 3 without 2 being filled as well.