Yes it's still under warranty, I'll contact the supplier tomorrow. Should I not try to format and re-install everything with windows 10? Or is it a clear sign that the GPU is dying? I only have this rig for less than 6 months is it possible that it is dying? Also I only overclocked 4 or 5 times and for less than 30 mins each time. I never messed with the electrical system too.
If you feel like trying a reformat, I think that's a great idea. If you do so and the issue persists with freshly-installed drivers and games, you'll have basically ruled out software as a cause.
It's unfortunate to have these issues with a new system, but it's not impossible. Sometimes products are defective, or mistakes are made in production. Maybe it was hurt in shipping, or zapped by static electricity or something.
Also, if it's dying, why it does affect games that have REMARKABLY less graphic needs and requirements than Guild Wars 2? I NEVER crashed on guild wars 2 due to graphic card. Archeage crashed numerous times, even though it has less graphic needs and my settings are on low (which are bad btw).
Dying cards can be very, very unpredictable in how they behave. It's not as simple as a correlation between crashes and framerates or perceived intensity of the game's workload. Games put differing amounts of stress on each system component, and even each video card component. I don't know why Archeage encounters this issue and Guild Wars 2 specifically does not, but it's not necessarily unusual.
If the issues you're seeing were only happening in Archeage, my first thought would be that there might be problems with some of the game files and that you should either use Steam's "Verify Integrity of Game Cache" feature, or just reinstall. But it sounds like the card is crashing in a lot more situations than just that.
I should also mention, a faulty or very insufficient power supply can sometimes cause this sort of behavior. A mid-range or high-end video card is usually the most power-hungry thing in the system by far, so it usually shows symptoms first when the PSU isn't providing steady, clean power to the system.
That said, I think that's unlikely here because the GT 630 is such a low-power card (probably lower than your CPU, actually). I think you'd be having whole system crashes/bluescreens in that case.