I've got dell optiplex 390 sff tower, and I want to upgrade its gpu

[bill.gkoutz]

I would like the gtx 1050 ti low profile
But I don't know if there's enough wattage 240watt
Do I need to get a new psu

 

[Dark Lord of Tech]

A GeForce GTX 1050ti needs 18 amps on the 12v+ rail and a 300w-350W power supply.
http://www.realhardtechx.com/index_archivos/Page362.htm
Here's a nice reference ^

 

[william p]

The Optiplexes have a 95W CPU limit, and SFF has very few bays or expansion slots to power. Also Dell doesn't sell PSUs by the watt. In their market a low PSU rating looks more efficient to people who buy 1000s of these computers and have to pay the electric bill. 240 W Is plenty. 95W CPU+75W GPU= 160W.