A gt1030 gddr5 or gt730 gddr5 are low power 30-40w cards, but for 3000 intel 12th gen i5 they still need at least 250w psu.  Load Wattage: 254 WRecommended PSU Wattage: 304 W The only possible way to support gt1030 with a 180w psu is if you have i3-12100 cpu, and sata ssd only, no dvd.  Load Wattage: 181 W If you have i5, you should consider upgrade to Dell oem 300w psu for 3000 sff. Dell oem discrete cards for Optiplex 3000 SFF:  AMD RadeonTM RX 640, 4GB GDDR5 (optional) AMD RadeonTM 540, 1GB GDDR5 (optional) AMD RadeonTM 550, 2GB GDDR5 (optional) Radeon oem 550 and 540 cards are both 50w in TDP.
I have an Optiplex 3000 SFF with integrated Intel UHD 770 graphics.  I would like to upgrade the video to a 2GB low profile, x16 PCIE card.  The reason for this is the computer will be used to monitor CCTV feeds and is very choppy right now when using the onboard video. Unfortunately the PSU is only 180W so I don't even know if it can handle a video card at all.  If this is the case I'm not sure why there's a x16 PCIE slot on the motherboard. Does anyone have any suggestions?
2GB low profile video card for Optiplex 3000 SFF needed