Poweredge T430 CPU upgrade

Hello I am currently running two E5-2620v4 CPU's and I'm trying to upgrade. I have two E5-2697v4 CPU's and it wont boot with both installed but it will with one installed. I am running them with a KX11M motherboard with two 750w PSU's. From reading other posts about similar situations I am gathering that the motherboard cant support the voltage draw from both CPU's. If thats the case then what CPU's should I be looking for when trying to upgrade to get some higher thread count?