Non haswell psu

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iceglidergiant

iceglidergiant

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Jun 29, 2014
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I was thinking about creating a build with a 4690k and a seagate S12II 620w psu, when I read that this psu is not "haswell certified" and therefore, if I use win7 and my computer goes into sleep mode, when I wake it up from sleep mode the computer will crash. I've read this is due to a new, power-conserving intel cpu state known as c6/c7 that only select "haswell certified" psu's can handle. I was wondering, will going into the win7 control panel, turning sleep mode to "Never", setting the display to turn off after, I dunno, 20 minutes, and setting the hibernate mode to 5 minutes after the display shuts off, will that do the trick? This way the computer never goes to sleep, only shuts of the display after 20 minutes and goes into hibernate mode after 25.
 
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cub_fanatic
That should work. But, just because a PSU isn't certified for Haswell, it doesn't mean that that sleep mode won't work. It just means that it is an older PSU. Usually, quality high end PSUs will work. If you don't need sleep mode, though, it shouldn't matter anyway but it wouldn't hurt to get a quality unit or even a HW cert. one.
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cub_fanatic

cub_fanatic

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Nov 21, 2012
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That should work. But, just because a PSU isn't certified for Haswell, it doesn't mean that that sleep mode won't work. It just means that it is an older PSU. Usually, quality high end PSUs will work. If you don't need sleep mode, though, it shouldn't matter anyway but it wouldn't hurt to get a quality unit or even a HW cert. one.
 
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Dark Lord of Tech

Dark Lord of Tech

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Aug 18, 2009
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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.

Corsair utilizes this DC to DC technology in most of their power supplies. Starting with the CX750 and CX750M and moving all of the way through the GS Series, TX and TX-M Series, the HX Series, both the AX Series Gold and AX Series Platinum, and the new AXi Series. So whatever your budget, if you choose Intel's new Haswell processor and wish to utilize the new, low power C7 sleep state, Corsair has a power supply

http://www.corsair.com/en-us/blog/2013/may/haswell-compatibility-with-corsair-power-supplies
 
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cub_fanatic

cub_fanatic

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Nov 21, 2012
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Yes, it is actually an above average brand (called Seasonic not Seagate, BTW); the highest quality PSU brand that is most frequently recommended by veteran enthusiasts. You should have no issues with it especially if you turn off sleep mode. I prefer to use hibernate as an alternative to sleep. It can be enabled in the advanced power settings by turning off "allow hybrid sleep".
 
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