flyercan :
I agree that the PSU upgrade is not required, But I would still recommend it if this system is going to be used for gaming.
This is purely your opinion.
I seen gaming Small Form Factor PC with 240 watt PSU and GTX 1050TIat trusted hands of one of Tomshardware regular adviser. He said that no problem have shown at gaming. Melissa has 365 watt PSU, more than 100 watt extra, and 65 watt over manufacturer requirement. I consider this enough for an entry level gaming PC. But this is my opinion.
flyercan :
I disagree with you about the system fan being needed so as to not cook any components. The CPU has its own fan as well as the PSU moving air in or out of the system. Once the GPU is installed it too will be moving a bit of air out of the back of the system.
You are right, CPU has its own fan with shroud, no questions here.
And that PSU will act as exhaust fan, which is correct, but it will have to deal with increased temperatures and so, its components will last less time.
Regarding GPU exhaust air.
Look at GTX 1050TI picture (same as GTX 1050).
How the air will be pushed out of the case? What I see is that air will be pushed from under the shroud in every direction possible, thus staying in the case and raising internal temperatures.
Only card like this can truly push air out, and that is the reason that I choose exactly this card as my upgrade from GTX 970 with 2 fans (and I have more exhaust fans than any prebuild PCs)
As you can see in this case, air has no other means to escape, but at GPU Bracket, shroud is seealed (to a degree of course).
flyercan :
Most systems can turn off fan alarms in the bios, I have never had a system refuse to boot because of a missing or bad system fan, but we can try unplugging it on this one and see what happens on boot.
Most of regular systems... Did you ever had Dell or HP? Have you ever went to Dell or HP BIOS by yourself?
I did, many times. I had Dell PCs since Win 3.1 (it was Dimension L series, I think) until Win 7 (Inspiron 570), and I fixed plenty Dell and HP/Compaq for my friends. I never seen anything related to Fan or Fan alarm controls there. So I doubt that this HP is an exemption to the rule.
PC might boot OK or might not. I know for fact that Insppiron 570 would not boot if CPU fan is not working, I have seen it first hand, similar goes for Inspiron 570 exhaust fan. In certain Dell motherboards you can boot without exhaust fan, but you would have to press F1 in order to proceed, every boot.