MSI RADEON RX550 4GT LP OC PCIE 4GBCTLRGDDR (R5504TPC)

Some of this question you posted in another thread.

It has been long established on YouTube that 240w-290w PSU's will power 75w cards.  Speedstep will disagree.  But, I have never received any negative feedback from actual users that it didn't work.

Optiplex 7020 SFF + GTX 1650 + YouTube 

If speedstep tried 75w cards on 240w-290w Dell PSU's, and it didn't work, and he posted videos, it would be more convincing.

Continuing with your questions:

1.  I don't know that a Fortron PSU will do you any good.  First, you said in your other post that the RX550 works fine without the drivers.  Something I've heard of is Secure Boot may need to be off.

1.5  Better is a 315w PSU that's normally for an Optiplex XE2 SFF.  Often a PSU can boast more total wattage, but skimp on other rails, like the 3.3v/5v rails and then it doesn't work.  Do you have a link to the PSU you're looking at?

2.  You can use up to 75w cards in the PCI-e slot.  (Speedstep will probably disagree here too.)  Limit I believe is by MB.  With 315w PSU, I'm not sure what the limit is.  Apparently, it does have a 6-pin PCIe connector.  120w? - speedstep would know for sure.  However, cards beyond 75w may be too much for your CPU, and then the CPU causes bottleneck.  Helps to know what CPU you have to see how it would pair with the GTX 1650 you're looking at.

"Theoretically, my configuration cannot exceed 150w of consumption and the power supply is factory-set to 255, so there is a reserve." - Unfortunately, this is completely wrong.  MB, CPU, and other accessories aren't taken into account here, including power to USB's.  Speedstep often points out PSU's aren't about a single spec of watts.  Not taken into the theoretical account is the MB, CPU, power to USB's, and any other accessories.  You still have to have enough power on other rails besides 12v one, like the 3.3v and 5v rails just to name two.  You try to draw more than 75w for a GPU on a 255 watt PSU and the PSU will absolutely trip.  A good PSU will shut down when overloaded or shorted.  A cheapy or non-name brand PSU might not trip and things fry.

Thank you for the comprehensive answer. I appreciate. The power supply has not yet been selected. I can buy any. It's just that Fortron is a good company and I'm sure the 400w one will handle the headroom with my setup (on all lines it will be much more powerful than the stock 255w). I just don't know if I'm spending my money for nothing. Nowhere is it clear what exactly limits the pci-e for the 7020 SFF. I do not know if it is the power supply itself or the motherboard and there is no way around it. The videos from YT clearly say that the GTX 1050ti and 1650 cards work without any problems, even on the pcie x4 (25w) connector. Unless the Optiplex 7010 SFF and 9020 SFF are different from the 7020 SFF because they were related to the movies. At the moment, I have 16gb of memory on board and an i5 4590. If necessary, I have the option to change to the i7 4770 with a small surcharge. A bottleneck is not a problem. RX550 works but only in bios and in the desktop but before installing the drivers. After installing them, I have a black screen. I have tried different systems and different driver versions. As I have already mentioned, the card works stably on HP (q9550 + 8gb ram) with 240w which surprised me a lot. I don't know why this 7020 is so problematic. I would change the SFF version to MT but I care about a small housing. Even if I were to lead the power supply outside it.

Secure boot is disabled by default and I haven't changed that.

Thank you for your response. It is a pity that I have already sent my RX550 back to the store. I think I had wrong options in my bios. Looks like I had CSM turned on. I upload photos with settings. My GPU version is exactly MSI RX5502GTLPOC (low profile). As for power. I already bought a 24pin to 8pin adapter a week ago. He is lying and waiting for the power supply. I want to extend the cables and hide the power supply behind my desk. It will look like a factory kit. The only question is whether the 7020 SFF will definitely work with the GTX1650 with a more powerful power supply.

Hi @mesiah1989,

"The only question is whether the 7020 SFF will definitely work with the GTX1650 with a more powerful power supply."

So I already linked a video showing it working and could link more.  It'll please speedstep and make him smile, if you use 315w PSU for Optiplex XE2 SFF.  You won't, and don't, have to worry about not being able to power 75w GPU card.

So I did some bottleneck checking with the I5-4590, I7-4770, and a couple of GPU cards:

Today I received MSI GTX 1650. Everything works perfectly despite plugging the card into the pcie x4 connector. The factory power supply works well and does not cause any reboots or instability. However, I will not tempt fate and I will order the 315w one. I am tempted to leave the card in the x4 connector and not combine with the power supply outside the housing. The performance is very satisfactory (tests show that the difference from x16 is usually 3-4fps) and the temperatures do not exceed 72c. It's a pity that Dell changed the order of the connectors and gave x4 at the top, but nothing can be done about it. Anyway, I confirm that the 1650 is fully stable in the Optiplex 7020 SFF, but I recommend replacing the power supply with the 315w version. Thanks to everyone for the tips. I hope this topic will be helpful to other forum users.