How much PSU power do I need for OC

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nofx13

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Jun 25, 2013
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Hello guys. Need mega fast help about PSU power. I order everything yet except PSU...

CPU: i5 4690K
CPU Cooler: Cooler Master Hyper 212 EVO
MoBo: Gigabyte GA-Z97-HD3
GPU: Sapphire Radeon R9 280X Tri-X OC
RAM: Crucial Ballistix Sport 8GB 1600Mhz CL9
HDD: Western Digital caviar Blue 1TB
SDD: Samsung 120GB 840 EVO
Case: Cooler Master Elite 430

I am thinking of Seasonic S12II-620 620W 80+ Bronze PSU, is it enough if I will OC? And maybe latter add one more HDD...? If not than maybe you can give advice for some good but not expensive PSU...
 
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Dark Lord of Tech

Dark Lord of Tech

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Aug 18, 2009
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Corsair explains it here.

When an Intel Core (i3, i5, i7) processor is idle, it goes into a sleep state that requires less power than when the CPU is active. Since the motherboard voltage regulation modules that provide power to the CPU gets their power from the power supply's +12V rail, these sleep states can dramatically reduce the load on the power supply's +12V rail.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

While we are still working with Intel on the details of the testing methodology they use to check PSUs for Haswell compatibility, it is already known that a power supply that uses DC to DC for the non-primary rails (the +3.3V and +5V) will not have an issue with the new low power sleep states. This is because a DC to DC buck converter is used to convert +12V to +3.3V and +5V. This means that no matter what load the CPU puts on the power supply, there will always be a load on the +12V because the +12V is required to provide power to +3.3V and +5V.
 
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