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Lenovo says................
Re:ThinkCentre M90p SFF: Graphics Upgrade Suggestions
2020-09-29, 22:14 PM
The M90p Type 5536 only shipped with a 240W power supply, so you are kind of stuck with that size.
Many of those came with an Nvidia Quadro 380 graphics cards, or the Nvidia GeForce 310, and Nvidia recommended a 350W powers supply for both of them, so you should be able to install a newer Nvidia GeForce GT 1030 without any Power Supply issues. The GT 1030 is about 1,300 times faster than either of the original graphics cards, so performance will definitely improve.
Below are examples of two 1030 models (one has DVI & HDMI, and the other Display Port & HDMI outputs). The top one has a fan to help it stay cool, and has both HDMI & Display Port, so it gives you more options if choosing newer monitors.
MSI Graphic Cards GT 1030 2G LP OC (Low Profile - HDMI and Display Port)
Robot Check
Asus GeForce GT 1030 2GB GDDR5 (Low Profile - HDMI and DVI ) (Fanless heatsink)
Robot Check
If you are a big gamer, you might also be able to install a Low profile GTX 1050 TI, but although Nvidia recommends a 300W PSU for both the 1030 and 1050, the 1050 draws around 75W vs 35W for the GT 1030, so you would have to know what power other devices in your system use (motherboard, CPU and, fans, HDD etc.) to ensure they do not exceed the remaining 165W.
Cheers,