I recently bought a GPU and after installing it turns out the PC reboots suddenly when playing videogames and I believe this problem might be because of the PSU... I believe the PSU might be starving of energy and then it shuts down to avoid damage...
( I am aware there are other brands that are supposed to be better like "Thermal-Take" or "Corsair" but this is the one I have so before you start recomending me please state if this PSU is good enough. I beg you to ONLY say otherwise if you have experience with the brand, heard or read of the brand before or encountered problems with the same brand. )
A GTX 550 Ti needs a minimum of 24 amps. Both my 12 volt rails are a bit below the minimum requirement. and only one 6-Pin PCI-Express cable is connected to the GPU. Does that mean its only recieving 21A? There is a part of the power chart where it says 38A which is underneath the +12v1 and +12v2 scheme...
I don't really understand how the 12 volt split works, could somebody explain it to me?
There was a molex plug with the GPU and I am not sure if that is actually the solution... I did use it but the PC reboot anyway so then I knew it was no use.
CPU: Intel i5 750 2.67Ghz
Motherboard: ASUS P7P55D PRO
RAM: Corsair 2x4Gb 1600MHz DDR3
HDD: Western Digital Caviar Green 1Tb 64Mb Cache 7200RPM
This is all the information I believe might be necessary to understand my problem...
The link there (to your PSU) doesn't work.
The original ATX spec says no more than 20A on the 12v rail.
Therefore to deliver 60A you need 3 x 12v rails.
Corsair (for example) completely ignores this, and supplies one 12v rail @ 60A.
Power supplies are notoriously cheap, and many do not do what they claim.
Regardless of power rating, I always look for a top-quality brand-name PSU with Active PFC (power-factor correction).
Active PFC gives you a constant output, regardless of input voltage.
Not just 115v vs. 230v - even in North America our 115v can swing wildly between 105-120v.
Active PFC is a must.
If the PSU has a little red switch, to select either 115 or 230v - don't buy it!
A 550ti isn't a huge power-hog.
One 6-pin PCI-E is on most PSUs.
But I do agree with you - if your PSU wasn't up to the job, things would be as you describe.
I use Corsair CX430 in all my (non-gaming) PC builds.
It has one 12v rail @ 32A.
But for gaming I see what's up at the time the build happens.
Watts are just a guideline - I feel better about a quality brand-name, and Active PFC of course.
An important guideline though... especially if one requires 4 x 8-pin PCI-E!
Always, always buy a killer PSU.
It is, after all, the foundation upon which the house is built...
Good luck to you,