how to check a psu?

Well you did change the RAM timings so that may well have solved the issue. Test at stock speeds with the second GPU, if all is well then you can start upping the overclock :)
 
everything has been set to stock , been able to get things running....for how long i dont know , maybe wise to get a higher psu when i can........thanks for your support.... will update if all goes wrong again.
 
No such luck , left the pc on last night to download some stuff, when i woke up i checked the event viewer at it seems the pc rebooted it self every 15 mins from 3:30 to 6:40 , had to reset the pc as when i went to turn on the monitor i could not get the display up......
 
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