From Dell-DylanJ's response in this link: https://www.dell.com/community/PowerEdge-Hardware-General/Video-card-on-dell-r730xd/td-p/7306384

...it appears that the R730 (well R730XD) should be OK with a Quadro K1200. 

However, I have tried installing one in the X16 slot (slot 4) in a Dell R730 and consistently get a PCIe link training failure error for that slot on boot. Both BIOS and iDRAC are on the latest versions. I'm slightly at a loss as to how to update the PCIe device firmware (suggested further down the error message) if I can't get the server to recognise the card in the first place.

The card doesn't have any additional power ports and recommends a 200W power supply (the server has 750W supplies), so I am assuming (perhaps wrongly) that the GPU upgrade kit is not required.

Any suggestions as to what I am doing wrong much appreciated. (The card is intended for use in a ESXi v6.5 VMWARE client on the machine.) Many thanks.