Yes, this is what I wanted to say.   Please check out the GPU installation guidelines here: [URL]
I have installed GPU NIVDIA NVS 310 (Dell part # K3WRC ) on my T440 (2 CPUs and 2 system fans,  2 750W PUs). Somehow, iDRAC can not detect the CPU is installed. Any suggestion?  
NIVDIA NVS 310 installation on T440 and iDRAC9 can't detect GPU