For installing second CPU you need to connect power cable for CPU2 as well. You can refer item number 25 in below link for details [URL] 
I have a T430 in production that I was considering adding a 2nd cpu to, but can't find any info about psu requirementsIt's a 16 drive chassis (only 6x drives filled, currently migrating to ssd's) with an h730, 64gb (4x 16gb dual rank dimms), redundant 495w power supplies, and a single E5-2620 v4 8 core cpuI'd be adding a second E5-2620 v4, and an additional 64gb of memory (matching the original configuration).Aside from the additional cpu, heatsink assembly, and additional/reconfigured memory, what else would I need?
T430 dual cpu upgrade (psu requirements?)