PC Rebooting when under load

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Joined
15 Mar 2012
Posts
33
I have an old i7-3770k overclocked to 4.4Ghz with an Arctic Freezer 12 cooler
4 x 4 = 16Gb DDR3 1600Mhz Ram
Gigabyte Z77-D3H mainboard
2 sata SSD drives
1 sata hard drive
1 sata DVDRW
3 x 140mm case fans
CX750M power supply

I recently swapped my 1060 6gb for a EVGA 2070 XC Gaming card, and since then I have experienced random power resets, CPU temps are ok, I went into afterburner and reduced the card max power to 80% and appear to have fixed the issue, does this mean my Corsair CX750M which should be more than "adequate" is failing and due replacement, before it dies and takes all with it.

I intend to update my CPU MB RAM etc to something newer, that probably wont be this year, but my understanding is newer CPU generations use less power than the older generations they replace.

I really need some help, what do I need to buy, online power calculators say I only need 550-590W so would a 650W PSU be enough or should I buy another 750W, if so I would like something more efficient, and quiet.

Recommendations please....
 
Just a follow up - I bought a Seasonic Focus plus platinum 750w and since installing it I have had no more shut down issues. So with a 10 year warranty I should be good for the foreseeable. Thanks for the suggestions.
 
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