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ASUS GeForce GTX STRIX 950 is not tested by Dell.
Following are the cards that are tested and are sure to work.
NVIDIA, GeForce GT 730
AMD, Radeon R9 360
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While it may fit in the case BARELY the stock power supply is too small. Some have overcome this Limitation by removing the tiny power supply completely and running the wires for a standard EPS12v supply in the back thru the hole left by removing the power supply and using an adapter.
This requires an adapter.
Inspiron 3650 [Intel] Service Manual,
Inspiron 3650 Specifications,
Note: Dell has not published the wattage of the Inspiron 3650 power supply.
Inspiron-3656 [AMD] Service Manual,
Inspiron 3656 Specifications,
Note: Dell has not published the wattage of the Inspiron 3656 power supply, plus this model has a BGA motherboard, that does not allow you to upgrade the processor, without replacing the motherboard.
Asus GeForce 2GB 128-Bit GDDR5 Graphics Cards (STRIX-GTX950-DC2OC-2GD5) is NOT a low power card nor is the other card EACH of those is OVER 75W and therefore needs a SIX PIN PCI-E aux power connection. Some overclocked cards need 2 X 6 pin or 1 X 8 pin power.
The itsy bitsy teeny weeny yellow poka dot power supply in the 36XX series is under 200w and DOES NOT USE standard power supply connectors and has ZERO 6 pin 150w PCI-E power connectors.
I've read many articles saying that the Amd RX 460 only needs 75watts.
"With a sub-75 watt power draw in its reference configuration, the RX 460 can draw all of its power from your PC’s motherboard, no extra power connectors required. That makes it an ideal option for giving a prebuilt “big box” PC beefed-up gaming capabilties."
Here's an article measuring the watts
"The RX 460 draws less than 75W, which enables it the card to draw all of its power via your motherboard’s PCI-E slot—no addition 6-pin or 8-pin power connectors required."