Good low power AMD GPU

Hey everyone. I currently have a Dell Optiplex 790 with a PNY GT 1030 GPU. I'm running a vanilla install of High Sierra and everything is going great. But, I want to be able to move to Mojave and since I keep reading the AMD cards work better with our hobby I want to see about swapping cards. I have found the MSI Radeon RX 560 card on ebay for between $70-90. Does anyone have suggestions for cards that do not use an external power? I do currently play a couple steam games, mostly CSGO if that helps. Thanks.

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