My PSU might have died and/or is old?

Hi I was recently playing CSGO and when I was in the middle of playing my computer turned off completely. I waited a few minutes and tried to turn it back on and it did not turn back on, so I unplugged the power waited a little, i hit the power button with it unplugged then I switched which outlet the power unit was plugged into and tried to turn back on my computer and it turned back on. My Psu and cpu is about 3 years old, I cleaned out my cpu and put a new cooler in there that has thermal paste and seems to be working, 22-28c in idle on motherboard. I also put in a new graphics card with a 8 pin connector. So do you think that my Psu died? I have the EVGA supernova NEX 750b. I appreciate any help thanks. it is not just Csgo it's whenever my computer is under a nice amount of load it shuts down, I did a small 3dmark test and walked away and came back and my pc was turned off, i tried to turn it back on and it did not turn back on until i switched the psu off and on, do you think my psu could be causing my pc to shut down during load?

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Clarification Request
Need a little more.

Think of the typical US car. If you drive it at 120 MPH it will need repair soon. Not so much at 65. Same idea for PSUs. I can't find PC details so I can't give a nod to this or that.

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Sorry!, here's my pc specs

Processor: AMD FX(tm)-8350 Eight-Core Processor
Memory: 16384MB RAM
AMD Radeon (TM) R9 390 Series
Disk & DVD/CD-ROM Drives
Drive: C:
Model: TOSHIBA DT01ACA100 ATA Device

I have all the information you could need, let me know if you need anything else tyvm!

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what's the wattage of the PSU?


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The wattage is

750 Watts

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From Tomshardware.

You didn't supply the exact R9 390 so let's use the peak Watts from this picture.

So at peak we have 383 Watts.
The CPU has a TDP of 125 Watts and we add 40 Watts for the drives.

This clearly blows past the PSU's 20 Ampere rails ( shows a QUAD RAIL unit) and would give you seemingly random power downs.

If only you had a single rail model then I'd check if we approached an Ampere issue but here, it's pretty clear this is the wrong PSU.

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The graphics card

The graphics card is the MSI R9 390, I heard that the max wattage for it is 300 watts

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And the rail is 20A which is 240 Watts.

300 is over the rail's capacity. I'll just write it. Stick to single rail PSUs unless you are conversant with Amps, Watts, Rail balancing, etc.

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Ok tyvm! im buying a the EVGA SuperNOVA 750 B2 80+ BRONZE

I did research and i was recommended the EVGA SuperNOVA 750 B2 80+ BRONZE, do you think it will hold up? someone told me it was fantastic

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