Is it my Power Supply?

So I just recently started getting random black screens while playing games.
It usually works for sometimes but then out of no where it just randomly turns black. I can hear some sounds, but its just a loop of the back round music, and it doesn't sound like it progresses much, but no new sounds appear , just the back round music

If I underclock the gpu, it appears that it does not happen
I checked the windows event log, and no errors appear besides shutting down unexpectedly

It hasn't really occured before I added my watercooling loop though. I don't know if its a coincidence, or if the fans and pump added just enough to put it over the top
I have noticed though that the power supply emits much warmer air than before I added the loop

I have an Antec 650w earthwatts
It has two 12v rails at 38 amps each

Some more system specs
i5-2400 @3.6 GHz
EVGA 570 HD superclocked edition
Asus Xonar DG
TP-Link Wireless adapter

Laing DDC-1T
1 Gentle Typhoon AP-14
2 Noctua NF-P12
1 Yate Loon D12SL-12
The above fans shouldn't be undervolted

2 NZXT 120mm case fan
1 NZXT 140mm case fan

I'm not sure if there is anything more that I should list, but the rest should be in the Sig Rig

Some one said that it could be something with the two rails, and one rail supporting too many things, or being mis wired or something of that sort
I tried using that PSU calculator, and it says I need about 600 ish watts, so I dont know if I really need a new one or not

But if I am in the market for a new PSU, what is the brand that everyone generally likes?
I heard that corsair makes really solid psus, but they have many different kinds, and I'm not sure which one is good

I had my eye on NZXT's hale 90 psus, mostly because it is white, and modular and has a gold 80+ rating
Speaking of ratings, I don't even know if its worth having a 750-850 watt at gold rating or if a bronze or silver rating will do

Thanks in advance!

Well since its water cooled, it stays way below any critical temperatures

I probably should have included that

the last time it crashed, the gpu was at 34C

I was logging it through gpu-z and theres not strange jumps in anything besides dropping straight to 0 when it crashes, and there are no further additions after one line of 0
actually, the gpu and memory controller load is at a "-" the same line as the 0s

I used the one on the sticky in this forum?

Hmm, well I'm not 100% sure about the not crashing underclocked, but it has appeared so.
I'll do some more testing and if it is true, then I guess I know whats wrong!

Thank you for your help!

I don't really know much about over clocking or over volting, but I guess it's time for me to read up on that!

+Rep

I guess I might've pressed some buttons

How would I raise the voltage of my card?
Msi Afterburner should be able to do that right?

I should really look into overclocking my card, especially after its under water

Thanks for you help by the way!