Call of What?

No worries, I can mostly understand you.
 
I believe w hen you select the 'Upgrade' option, all of your files will be left as they are. I don't believe that you need to re-format your PC just to install Windows. The reason people generally recommend a clean install when switching motherboard and CPU is because if the correct drivers aren't present then there's a chance it will not boot/function properly.
 
If you really care about the data, you shouldn't be "too lazy" to back it up. The 'Upgrade' / whatever the option is that allows you to keep all your files should just re-install Windows over the top, and move all your old files to a 'Windows.old' folder, where you'd have to move them back to their original locations.

So, I had a little bit of trouble understanding what you meant since you mention booting Windows 10 from USB. I assume you mean booting the Windows 10 installer from USB.
 
In which case, you should be able to install over the top of your old installation and keep your files, yes. For safety, if there's anything super mission-critical I'd recommend backing it up before hand, but other than that I believe you have the correct idea.

If you want to game, you are better off with higher IPC. And that's ignoring the multiple other downfalls that the 9370 has.
 
Go with the i5. Possibly even aim for a Skylake i5, depending on the price.

The i5, it has stronger single thread performance which is what games want versus high core counts.

i5 no contest, games don't like 8 core fx chips very much when compared to an i5.

yeah. that's perfect.

The case will be just fine with that Motherboard. No issues. 

amd has nothing on fm2 or fm2+ that will fully use a 290 reliably. so if you're going with intel when you upgrade then definitely spring for a 290 if you're sticking with amd's fm platform then i'd recommend going for a 280.