It should work plug and play without issue and does not require power supply upgrade. 460w is fine for a 75w card. PCI-E 3.0 x8 is exactly the same speed as PCI-E 2.0  x16 There is zero performance hit for the 89xx series for X8 pci-e 3.0 cards. PCI Express 3.0 connection was specified in 2010, with a maximum theoretical transfer rate per lane of almost 1 GiB/s (actually, 984.6 MiB/s), twice the rate of the PCI Express 2.0 standard that offers 500 GiB/s per lane. Thus, a PCI Express 2.0 x16 slot offers a maximum theoretical bandwidth of 8 GiB/s, while a PCI Express 3.0 x 8 slot is also 8 GiB/s. HOWEVER non dell cards require SECURE BOOT OFF in bios or the card will not post. [URL] PCI Express 3.0; the first NVIDIA chips compatible with this standard were from GeForce GT/GTX 6xx generation, while the AMD models use it since Radeon HD 7xxx models. Current Pascal and Later cards are all PCI-E 3.0 cards as are Radeon RX Series.  This is also why the Aurora R10 having PCI-E 4.0 bus has X16 slots wired at X8  
I just wanted to do a quick sanity check upgrading from the GT 730 to this:   [URL]   It looks like I do not need to update the power supply and that the card should fit. Does this seem like it would work? Any experience with this?   Thanks.
XPS 8900, upgrade to GTX 1050 Ti