Seasonic 620W M12II does not support haswel

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ko888


GIGABYTE - UEFI DualBIOS ==> M.I.T. ==> Advanced Frequency Settings ==> Advanced CPU Core Settings

Change "C6/C7 State Support" setting from [Auto] to [Disabled].
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ko888

ko888

Titan
Feb 18, 2009
16,708
41
84,990


GIGABYTE - UEFI DualBIOS ==> M.I.T. ==> Advanced Frequency Settings ==> Advanced CPU Core Settings

Change "C6/C7 State Support" setting from [Auto] to [Disabled].
 
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Solution
L

littleleo

Splendid
May 8, 2009
4,097
17
23,465


The C6 & C7 are sleep states that Intel's new Haswell CPUs intorduced. The idea was for the computer to go into a deeper sleep state that uses even less power then earlier sleep states. The problem is most power supplies were not ready for this new sleep state so when the system dropped to this new lower state the power supply thought the system had turned off not gone to sleep, so they won't wake up with a simple keystroke as before.
You can't expect power supply manufacturers and computer resellers just to throw their existing stock away over this issue. Just turn off in Bios or add a case fan, problem solved.
 
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ko888

ko888

Titan
Feb 18, 2009
16,708
41
84,990


PSUs based on older circuit designs that use group regulation will go out of ATX12V specifications when a very low current draw of 0.05 Amps on the combined +12V rails as would happen when a Haswell CPU enters into C6 or C7 sleep state will trigger one of the PSU's protection circuits resulting in a system that will not wake up.

The Seasonic M12II -620 is one of these PSUs based on the older group regulated design.
 
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