Assuming you mean a video card, it all depends on which PSU you have in your system. It could be anything from a 300W to a 460W to a 1000W and without knowing which PSU you have exactly, the range of GPUs that can be installed is pretty wide.

@Edn Acev 

@JOcean 

Stock Inspiron 3650 PSU is 8 pin proprietary 290W

Optional PSU is 365W

Same thing as Optiplex 9020, Precision T1700, etc.

Max card is 50W TDP Yeston RX550 which is 5x faster and 4gig Ram vs GT1030 but more expensive than a GT1030

Precision 3650 is 300W stock with optional 1000W I think.

Yeston RX550 B0953673BB

There is even an engineer who designed his own adapter.

Raphtec dell poweredge t20 power supply adapter

The following Dell OEM full height but short video cards work with Dell OEM 365w PSU =
7VK45 365w, Huntkey
T1M43 365w, Delta

DVP9W Nvidia GeForce GTX 1050 Ti, 75w
36V90 Nvidia GeForce GTX 1060, 120w
24K8H Nvidia GeForce GTX 1050, 75w

Standard PSU Does NOT Fit inside the case.

Hello,

need card PCIe ethernet  compatibility for precision 3650.

Best Regards!