PC sometimes shuts off without warning

[Riptide12]

I built this gaming PC like 8 months ago and up until recently I had no issues. But the last couple weeks, my PC will randomly shut off without warning. I've only gotten a BSOD once, and then never again. Also, sometimes its not my PC that crashes, but only the display. It just goes black or turns into a ton of stripes.

This happens about once a day or two, but I feel it's going to get progressively worse.

My CPU used to be really loud but recently I cleaned out the fans and re-applied some thermal paste and now its almost silent.

I never overlock.

Here are my HWMontior readings

http://gyazo.com/367e1cb74629c94e7f43042cca75553a

I'm on Windows 7.

PC Specs in case you need them:
430W PSU
8GB Ram
R9270x Asus GPU
AMD Athlon X4 860K Quad Core Processor 3.70 Ghz
1TB HDD
ASROCK FM2A55M0VG3+ Motherboard


What's causing my PC to shut off sometimes, and what can I do to fix it?

Thanks.

QUICK UPDATE: Display also temporarily switches off when I attempt to change resolution. This is a little side not main problem is still the above.

 

[Cazalan]

+1 on the power supply as probable cause

 

[Riptide12]

So replacing my current PSU with this http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013

Will solve my issues with my PC crashing and gaming?

 

[Riptide12]

Also, will getting a better PSU make my PC preform better since the graphics card requires a higher voltage?

 

[Sergeant_Sneaky]

Also, will getting a better PSU make my PC preform better since the graphics card requires a higher voltage?

Your components probably haven't been running at full speed so yes, you will probably see an increase in performance compared to what you currently have.

 

[jacquesfrost13]

Is your PSU a branded one or a just a generic one? Generic ones tend to be rated lower that what is published on their case. Not to mention poor delivery of current to your parts. Switching resolutions does give a quick black screen, but that should just be a couple of seconds.