is the only model that might fit into SFF However being a 75W card means the power supply is too small. That's per Dell's specifications on 40W card max.  Secure boot must be off for RX550 not from dell but CSM legacy mode must also be OFF because Legacy roms are not supported on RX series only GPT UEFI. [URL]  
Hello. I couldn't find the exact answer to my question by browsing the forum. I purchased an RX550 low profile card for my 7020 SFF with a 255w power supply. The image is displayed both in BIOS and in the desktop. The problem begins with the installation of the gpu drivers. The monitor turns off and on showing the no signal message, and the card fans start spinning a little faster. My computer seems to be working normally at this point. There is no restart, only no image. This is true for both pcie x4 and x16 connectors. The card was tested in another computer and it works fine (HP SFF 240w power supply). The monitor is also fully functional. The card has a TDP 50w and according to the posts on this forum, that's too much for this version of Optiplex. There are movies on the network with gtx 1050ti and gtx 1650 on these computers, but it seems suspicious to me. To the point. I bought a 24pin to 8pin adapter and plan to order a more powerful Fortron 350-400w power supply. The cables will be extended and the power supply will go outside the housing. The question is as follows. Will replacing the power supply with a larger one 100% solve my problems? Does the bios or motherboard have any power limit for pcie x16? Everything crashes into the power supply itself and the lack of power? Theoretically, my configuration cannot exceed 150w of consumption and the power supply is factory-set to 255, so there is a reserve. Ultimately, I plan to assemble the GTX 1650. I will be grateful for any suggestions.
Optiplex 7020 SFF GPU upgrade problem.