Weak PSU issues

[spitfire23]

Hows it going guys,

I'm having a few issues with gaming from which I Presume is my PSU being weak.

Now the issues are,my games completely freeze and I can't exit or do anything,other than restarting my pc,and this occurs mostly when I increase the graphical settings in games,

For example, in Battlefield 4 when I turn my settings to full Ultra the game literally frezeed and the computer became unresponsive and I'm forced to restart the pc from the power button,now the FPS isn't the issue here I can score solid 40-50 fps on high settings when playing battlefield 4. My pc pretty much meets the minimal and recommended system requirements to play the game,but my low end PSU might be the cause of these screenfreezes and making my pc unresponsive.

I want to add that these freezes don't occur when I'm playing low end games like WoW.

Rig:

Intel i5 2400 3.1Ghz @ 3.4GHz Turbo
HD Radeon 6870 1GB
8GB DDR3 1333MHz
420w Spire - shut psu I'm I right?

Now I at the moment can't afford a new PSU because I'm kinda broke xD but I do wanna know how can I prevent my PSU from overheating and also how to prevent it from damaging other pc parts if something bad happens to it.I regularly clean my pc from dust and I'm forced to play games on low settings because I fear I might set my pc on fire However is there some kind of advice any expert out here can give me ?

Thx

 

[Dark Lord of Tech]

420w Spire - shut psu I'm I right?

Yes very very poor.

Here's a great one.

PCPartPicker part list / Price breakdown by merchant

Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($55.48 @ SuperBiiz)
Total: $55.48
Prices include shipping, taxes, and discounts when available

 

[chugot9218]

Personally I am amazed you get those FPS on a 6870, I take it you are not running at 1080p?

 

[spitfire23]

Am running on 1980x1080 1080p yes

so anyways anyone got any tips to keep my psu from blowing up
:s ?

 

[nukemaster]

Beg and borrow to get a new psu. It would suck to loose more parts if it failed and took parts with it. Many times a bad or overloaded power supply can cause freezing(a better one should just shut off when overloaded).