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+5V low

Last response: in Components
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Hi guys, need your help on this

I have been running my system (i7 2600k) at 4.0ghz, 1.15V for the past month or so. I just tried clocking it to 4.2ghz at 1.18V but started getting low voltage warnings for my +5V and the system eventually shut down (but without a BSOD)

I've reverted the clock settings to 4.0ghz @1.15V but the voltage issues have not gone away. I'm assuming the system crash is due to the undervoltage, but I've no idea what's causing it.

Any advice on this matter?

Specs:
I7 2600K
CM Hyper 212 Evo
ASUS P8Z68V
Cougar SX 850W
MSI GTX 560 Ti Hawk
2 x 4GB Kingston HyperX 1600MHz DDR3
Crucial M4 128GB, Samsung F3 1TB

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Power supply Master

1. Check voltages in bios, bad there, time to worry a bit.
2. Check voltages with a DMM, bad there, time for a new psu.
3. Don't have so many monitoring packages open at once, they are known to be innaccurate and sometimes ( IME ) don't play well with each other.
 
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