Dell Vostro 3681, which power source?

unfortunately this model like many other entry level Dell 3### desktop does not support dual slot width gpu including the low profile RTX 3050

the 3### is Dell entry level in Optiplex/Inspiron or Vostro.  It is very user unfriendly in terms of upgradability.  the x16 slot is right next to psu so you can not install a dual slot low profile gpu  unless you install a psu outside case.  the x1 slot has a closed end forbidding gpu install, and it is wired to x 1 lane.

the 3### sff is only good for low power low profile single slot width gpu such as the Dell oem Radeon ones.  Try to choose GDDR5 and not gddr3 oem gpu.  RX550 or R5 430 are some Dell gpu options.  RX6500 or RX6300 are the newest Dell oem gpu that would fit.

PS Optiplex 9020 SFF is a high end optiplex model which has a PCIex4 slot with open end.  so user can install a dual slot width low profile card in that model.

in summary the only way to install RTX 3050 LP in V3681 is to move psu outside case.  not everyone likes to do that.

Thank you very much, sorry for my bad English. Can I use this low profile gpu with a single slot? And another thing, if I can use it, what power supply do you recommend (cheap, I have a difficult financial situation) for my PC with this card.

Thank you very much, so it won't damage or strain my PC even though the power supply is 200W and I have 20GB of RAM instead of the original 4GB? (I changed). Thank you very much in advance, in case of SSD can I also add it without fear? Just this more

a minimum of 250w psu

Load Wattage:247 W
Recommended PSU Wattage:297 W

V3681 has 6+4+4 white pin same as Optiplex 7080

upgrade to 260w or 360w psu 

stock 200w psu too weak

@redxps630​ Ok, thank you very much, which power supply of at least 300W compatible with the size and model of the Vostro 3681 and at a good price do you recommend?