Yes that one would be ok.  these are modern 24 pin ATX psu c/w 9020 via 24-8 pin adapter. PS 3.3/5v referred to ATX 2.0 introduced in 2003.  In ATX 2.0 standard, the power on 3.3 V and 5 V rails was significantly reduced from ATX 1.x.  The power allocation between 3.3 V, 5 V and 12 V rail is very different between older (prior to 2003) and newer ATX PSU (after 2003) designs, as well as between older and newer PC system designs.  9020 is released in 2013.  
Hi, I bought this 9020 MT half a year ago to act as a server, and it has been great. However, right now I am thinking about adding a gpu like a 6650 XT so that I will be able to play some games sometimes (and of course, when I am gaming, I will have all of the server programs shut down to reduce stress on the machine).  Currently my 9020 MT has the built in cd drives, 3 hdd, 1 boot ssd, and 4 stick of ddr3 ram that adds up to 8GB (plan on buying 4x8GB sticks soon).   I have been looking around the forum for a bit, and it seems like I need a Dell PSU adapter (recommended around) and a PSU with 3.5/5.5V combined power of at least 120W (or like 150W for a GPU with a TDP of 180W)? What is the minimum combined power I should look for?   The only ones that I am able to find that has 150W on the two rails is an RM750x for $120. The recommended BR700W by others is no longer on sale (and I am also a bit concerned that it only has 3 years of warranty). The other recommended CX750 are jacked up by scalpers on Amazon. Are there any other PSU I could look at (and if RM750x is good enough)? I am hoping to one day move the PSU and GPU into a more modern custom build PC in the future (maybe 1-3 years down the line).
Optiplex 9020 MT, upgrading PSU for a new gpu RX 6650 XT