The board can support RX470, but: A) the stock Dell power supply that comes with that Inspiron might not have enough wattage or an 8-pin video card cable, and B) you might find the card limited to PCIE 2.0 speeds for some reason. I know in theory the cpu's PCIE 3.0 is supposed to be passed straight through to the video card slot so it shouldn't matter what the chipset supports, but in practice GPU-Z says my 750Ti is stuck in 2.0 mode no matter what. C) THAT SAID, 16 lanes of PCIE 2.0 is still a lot of bandwidth, and a RX470 isn't really enough GPU to max it out under normal conditions, so you shouldn't see more than like a 2% - 3% performance penalty at most. It'll probably be fine. D) HOWEVER: RX470 was a popular crypto miner card, so a lot of the used ones you'll see on ebay have been flashed with a special mining BIOS that makes it good at pumping out bullshit pretend scam money but terrible at running games. You can *maybe* flash it back to its original BIOS if you can find a copy on techpowerup, but be careful.
