The 1650 requires a 300W PSU and you have a 260W in all likelihood. This video should be very helpful as it shows a PSU upgrade and various compatible GPU for your system.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
The video recommended by JOcean is indeed very helpful. This guy had made many useful demo optiplex tear down n upgrade YouTube videos. the ASUS card you are interested in has a suitable length for 990 (less than 7”), its width is 5”. 990 MT case width is 6.89”.
JOcean
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Posted December 20th, 2021 05:00
The 1650 requires a 300W PSU and you have a 260W in all likelihood. This video should be very helpful as it shows a PSU upgrade and various compatible GPU for your system.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop