Here are the manuals with info that should help-- Support for Dell G5 5090 | Documentation | Dell US    
Hello all, I’ve been kicking around the possibility of upgrading my GPU and/or RAM and I had a few questions.  I currently run a 2060 super and was looking at 2080 super or potentially 3060 ti if I can get my hands on one. I’m assuming these would be compatible? I’m also looking into upgrading my ram as the current stock ram is low MHz. My issue is that the current setup doesn’t have access to turn on XMP to increase MHz output. So I’m wondering what benefit, if any, doing either of these will do for me?   I use it strictly for playing first person shooters(call of duty lol) Specs inspiron 5090 i7-9700k 3.0mhz w/turbo boost 2060 super gpu 32gb ddr4 ram @ 2666
Upgrading my Inspiron 5090