Recommended AMD Graphics Upgrade for his Computer

im going to replace his psu for sure, just need to find the right Wattage that will work, nothing too over the limit, maybe 100 over his current one, but it will be good for his computer

I forget what type of computer casing his setup is, so I can make sure the PSU ill get for him will fix his casing; my computer is a Dell XPS 8700, and despite a number difference, the shape of his computer and mine are pretty much the same, right down to the placement of hardware I believe (Taking the metal cover off to expose internals, our PSU's are at the very top left corner)

Hi,
Dell is not too kind to third party power supplies.
Make sure the power plugs are the same dell tends to do it's own thing I've read.

there might be a bit of a problem with the rx580; right now, im trying my best at winning an auction for one of them under triple digit amounts, but everyone is gunning for it, so a.t.m, I dont have it; and to the best of my knowledge, his BIOS is as updated as it can be with his dell computer, only more updaed would be getting a new computer, and money is a bit tight for that particular venture

- - - Updated - - -

look, I get he has an AMD card and mine is an Nvidia, and as much as I want to try to keep him on the AMD path, to make it easier on myself and my wallet, I might go on the nvidia path and get him the same graphics card I got (GTX 960)

if I can't fight for the rx 580 and win, is there an amd graphics card under the 580 that will perform just as good with rust even if said card is a few version digits under?

well I made the call, got him an rx 570 I managed to find for a good deal on ebay, and an new 24" monitor with amd freesync capabilities, so if he does decide to do some heavy gaming one day, configured right he'll get no screen tearing

frankly, he needed the monitor, like I mentioned above, he's got BAD screen burn on his old one, so much so that one time he left it on some M Rated stuff, and even after closing the windows and putting it on sleep mode, when he took it out and had to give an app on his computer admin access, that M-Rated content was still visible

ill be sure to try and convince him to go to windows 10 after the card and monitor arrives, should be a good deal for him; now if I could solve that latency problem with ds4windows and my ps4 controller that'd be nice, but that's an issue for another time

his graphics card came in today, and before I put it in tomorrow (when his new monitor comes in) and up his OS to windows 10 to match it all up, I just need one question answered regarding the driver software

ASUS has its own stats page for their editions of the amd software (his over here), and amd has its website with its software here. Would I be better off using the amd driver software from ASUS, or just grab it from the amd website and use that instead