Not sure if you have the 180w or 240w PSU.  Spec Sheet (attached below) lists a max of 50w for a GPU along with a list of compatible cards.
I had tried to install Yeston GTX1650-4G(TDP is about 75w) on  the pcie 16x slot of  my Precision T3420 sff. then  the HDMI shows no signal. Instead of the pcie 4x slot the HDMI have the right signal. ...... is that a right installation? I wonder to know, what happens about the  pcie 16x slot? thanks for answer
IS THIS POSSIBLE FOR Dell Precision T3420 sff INSTALL GTX1650