Considering what you want to do, I would use higher than 1100W but honestly, there are many components that might affect power consumption on server. Honestly considering that many parts of the server affect the power consumption, I can recommend you to calculate this. You can use this EIPT tool to help you choose the R740 from the rack servers and choose the parts from the right side and choose a PSU suitable for balanced power consumption. This is a very useful tool. here is the link [URL]    Hope that helps!
Hi  I am trying to use the Xilinx Alveo U250 card with a Dell Poweredge R740 server. The card requires 75W of power from the x16 PCIe slot and 150W from the auxiliary PCIe 8pin supply.   What is Dell Power Supply that I can use ? Will Dual Power Supply of 750Watt each suffice or I need to have 1100 Watt Power Supply ?   How about if I want to use 2 Xilinx Alveo U250 Card, Which Power Supply is recommended ?   Thanks      
Dell Poweregde R740 FPGA card support