Dell offered an 850W PSU as an optional upgrade, if that gives you an idea of what PSU you might want to get. I have a Dell OEM GTX 1660 Ti and the 850W PSU in my XPS 8930. Dell also sold this model with RTX 2060, RTX 2070, and RTX 2080 Super GPUs. Just make sure the PSU meets any specific card's minimum PSU requirements. Not clear if any of the brand new RTX 30xx cards will work - or not. Another thing to watch is the length of the specific card you choose. There isn't a lot of space in this case. IIRC, the max video card length is ~10.5", but confirm that for yourself.  Keep in mind that heat/noise can become an issue when gaming with a higher end CPU and GPU. There are lots of threads about mods for installing bigger (and more) fans, better heat sinks etc. So read some of those threads. Don't disable the onboard Intel Graphics before/after installing a new GPU. Windows will automatically detect and use the add-in GPU, even with Intel Graphics enabled.
Hello I was wondering if anyone could give me good GPU suggestions for my Xps 8920, I got this desktop a while ago after hurricane Harvey and wasn't super informed on computers the way I am now, but now I wanna upgrade my tower for a better gaming experience, I know I'll have to upgrade my PSU I was thinking 700w, but I'm still iffy on a good GPU, the only one that might work is the gtx 1660 super. Thank you
XPS 8920, GPU suggestions