i7 4770/GTX 770 restarts PC while gaming

[Simpl3vol2]

Hey Guys,
I just built my new PC and everything was working fine until I tried to play some games...
When playing League of Legends, after about 8-10 minutes the pc restarts itself.
I started to recreate the crash but this time observing the gpu temperature with gpu-z, the last lines of the saved log before the crash are as follows:

Date        , GPU Core Clock [MHz] , GPU Memory Clock [MHz] , GPU Temperature [°C] , Fan Speed (%) [%] , Fan Speed (RPM) [RPM] , Memory Used [MB] , GPU Load [%] , Memory Controller Load [%] , Video Engine Load [%] , Power Consumption [% TDP] , PerfCap Reason [] , VDDC [V] ,
2013-10-13 22:14:26 ,             1123.5   ,               1752.8   ,               61.0   ,              54   ,                1770   ,            360   ,         54   ,                       31   ,                   0   ,                    53.2   ,              12   , 1.2000   ,

2013-10-13 22:14:27 ,             1123.5   ,               1752.8   ,               61.0   ,              54   ,                1770   ,            360   ,         57   ,                       33   ,                   0   ,                    54.2   ,              12   , 1.2000   ,

2013-10-13 22:14:28 ,             1123.5   ,               1752.8   ,               61.0   ,              54   ,                1800   ,            360   ,         57   ,                       32   ,                   0   ,                    53.9   ,              12   , 1.2000   ,

2013-10-13 22:14:29 ,             1123.5   ,               1752.8   ,               61.0   ,              54   ,                1770   ,            360   ,         59   ,                       33   ,                   0   ,                    52.9   ,              12   , 1.2000   ,

2013-10-13 22:14:30 ,             1123.5   ,               1752.8   ,               60.0   ,              54   ,                1770   ,            360   ,         53   ,                       30   ,                   0   ,                    52.3   ,              12   , 1.2000   ,

Fan speed is around 54%, the temperature is around 60°C, so overheating shouldn't be an issue.

My guess would be that either: 1. PSU or 2. Drivers

The PSU I am using was suggested by a friend, it's a be quiet L8 500W, now I thought that maybe 500W wouldn't be enough, but after some research it seems like a good 500W PSU should handle the card easily. But because I custom built my PC I fear that maybe I have to regulate usage manually through the BIOS? I am not sure, that's the only thing I could think of, which could cause such a problem.

I am using the 327.23, I know that in the past some drivers had issues with the 770, but I've no expierence as I was using AMD Radeons earlier.

My System:
Be Quiet! L8-500W
MSI Z87-G45 Gaming Motherboard
G Skill DDR3 16 GB
EVGA GTX 770
i7-4770
Samsung SSD 250 GB
WD 1 TB HDD
Noctua NH-U12P

I would be grateful if someone could help me!

 

[PP Mguire]

When doing load testing, you should always include your CPU as well.

But I can pretty much already tell you, definitely PSU. Minimum recommended is 600w, and although that L8 is a decent unit, it probably isn't able to hold up. (Even though in theory it should).

Your GPU temps look good, so it's either going to be CPU temps or PSU.

 

[Simpl3vol2]

Thanks for answering! I will get a 700W be quiet one as soon as possible.

 

[PP Mguire]

Don't forget to double check those CPU temps. If you're running the stock cooler it's a 50/50 chance that could be it too.

 

[Simpl3vol2]

It was the PSU, I just replaced it with a 650W Corsair one.

Thanks for your help!