Windows 10 has proper DirectX support which will aid gaming in the coming months, better optimisation and security. Your GPU if made by AMD/Nvidia/Intel will also support Win10 out the gate.

It's a visiontek radeon r9 280x

Yes that will be fine then

I've upgraded one of my old PCs to Windows 10, it was bought in 2007 and had Windows Vista, I think your PC will be just fine and W10 works a lot better than 8.1 did in my opinion. I've had zero problems using it.

There is a lot better performance on Windows 10 and it has a more Win7 feel to it if you prefer that.

I personally like the "App" style start menu so I opted to keep it like that on Windows 10 instead of using the classic start menu.

I'm going to throw my experience in here.

I was using windows 10 since it was made public and I loved it for quite a while, but after a while of using it everyday I noticed that the memory usage in the task manager would spike up to 70-80% on idle! So I was trying to work with it, but since it was like that on idle it would be even worse when playing games like GTA 5 and Battlefield. This is called memory leak. I tried a couple different fixes that worked for some people and didn't for others. I was in the group that noting worked for me. So I figured the only option I had left was to downgrade from windows 10 to windows 8.1. Right now I'm on windows 8.1 and already I notice my memory usage idling at 33%. I'm pretty sure that's what it should be idling at. At the moment I'm installing GTA 5, So I'll update this post when it's finished installing and I play for a bit on it.

Sabered wrote I'm going to throw my experience in here.

I was using windows 10 since it was made public and I loved it for quite a while, but after a while of using it everyday I noticed that the memory usage in the task manager would spike up to 70-80% on idle! So I was trying to work with it, but since it was like that on idle it would be even worse when playing games like GTA 5 and Battlefield. This is called memory leak. I tried a couple different fixes that worked for some people and didn't for others. I was in the group that noting worked for me. So I figured the only option I had left was to downgrade from windows 10 to windows 8.1. Right now I'm on windows 8.1 and already I notice my memory usage idling at 33%. I'm pretty sure that's what it should be idling at. At the moment I'm installing GTA 5, So I'll update this post when it's finished installing and I play for a bit on it.

I've not noticed a significant memory leak since having windows 10 from about September. Whatever problem you had must've been fixed or local only for you.