plushkinn

The only difference between the 550W and 650W is that one is the watts. You'll have some room with either, just more with the 650. And yes, it's not just about efficiency. I'm just going to link the thread on it so I don't have to type it all out: 
 

Not just one of the parts. It can take the whole system with it

Please replace it. I beg you. That Cheapo PSU can break your whole system so don't ever cheap out on PSUs.

Because if it breaks and takes one of your parts with it you will regret it for the rest of your life

Get a GPU. Compared to that big of an upgrade, the benefit from adding an SSD for gaming is so minimal you shouldn't even consider it.

It depends on your Windows and BIOS settings. When Windows is in Balanced mode, it will automatically throttle the CPU, but it will not reduce voltage. When overclocking your Ryzen CPU, ensure that you're using adaptive voltage or something similar - for testing purposes, using an explicit voltage might be the best route, but afterwards, change it to adaptive or the CPU will remain at that voltage constantly.

Okay I'll install all drivers and try this out.

The bootloader is on had not ssd, you should unplug the hdd before installing windows 

Just asking for a science. Would be not good if I'll buy a OS and won't work. Thanks. Going to get Win10

Thank you!

Try the 240GB Kingston SSDNow V300. I'm using one right now. It's been wonderful for me. 

as long as there were drivers for any previous version of windows it will work secure boot just only boots trusted OSs so windows would work fine even if it didn't you could turn it off in BIOS 

Secure boot is software protection. The SSD is hardware.
So long as it's SATA and not in M.2 form, any SSD will work.