Crashing and BSOD

[khorexcell]

So it's been almost a year since I've bought my new PC and so far I haven't had any problems until recently.
Devil May Cry 4 and the newest installment in the franchise DmC: Devil May Cry keep crashing for some reason. The crashes occur usually after 5-10 minutes of gameplay (usually it just stops working, but I did get the blue screen once).
Now the other games I play (WoW, Transistor, Civilization V) don't cause any problems whatsoever.
For the record, the GPU is not overheating, I monitored it and it doesn't exceed 50 degrees(Celsius).
Also I've installed the newest Catalyst beta, fully updated DX and .NET framework.
I'm running Windows 7 64-bit (recently reinstalled).
Lastly my specs are:
3.50 gigahertz AMD FX-6300 Six-Core
GA-78LMT-S2 (motherboard)
AMD Radeon HD 7790
8 gigs of RAM(1x8GB KIngston HyperX Blu 1600MHz C10)

Any ideas on what the problem might be?

 

[neon neophyte]

what psu are you using?

 

[khorexcell]

@neon neophyte
Forgot to enclose that, it's an OEM ATX 550W E1.

 

[neon neophyte]

that's probably your problem. a quality psu will most likely clear everything up for you

 

[khorexcell]

But I'm thinking that if that was the problem, wouldn't it have come up earlier? I mean, I've played much more demanding games than these two and this never happened.

 

[neon neophyte]

psus degrade over time