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Seasonic 620W M12II does not support haswel

Last response: in Components
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March 3, 2014 1:20:05 PM

What should i do to make it support hasswel,can 620w psu power up a asus r9 290 non oc
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a b V Motherboard
March 3, 2014 1:27:36 PM

What do you mean it doesn't support Haswell?
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a c 1935 ) Power supply
a c 807 à CPUs
a c 1034 V Motherboard
March 3, 2014 1:30:08 PM

Can 620w psu power up a asus r9 290 non oc?< Easily

It's not officially supported , but it will run that GPU and a Haswell system
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March 3, 2014 1:45:15 PM

In newegg,they say no haswell support ,for this model Seasonic 620W M12II.
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a c 1169 ) Power supply
a c 107 à CPUs
a c 216 V Motherboard
March 3, 2014 1:47:50 PM

You will need to disable Haswell's low power C6/C7 sleep states in your motherboard's BIOS Setup.
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March 3, 2014 1:50:02 PM

How could i do it,step please,i have g1 snipe z87 killer
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March 3, 2014 1:54:25 PM

Just go into Bios and disable sleep state C7, or just add a case fan like a 12CM that should keep enough load on the system to keep it from dropping into a deep sleep state.
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March 3, 2014 1:57:45 PM

Ok,ill tray it,but just for knowage,what is c6,c7 stat mean,and why most psu does not suppert it?
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a c 1169 ) Power supply
a c 107 à CPUs
a c 216 V Motherboard
March 3, 2014 2:02:10 PM

Aae 28 said:
How could i do it,step please,i have g1 snipe z87 killer


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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March 3, 2014 2:09:25 PM

Aae 28 said:
Ok,ill tray it,but just for knowage,what is c6,c7 stat mean,and why most psu does not suppert it?


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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a c 1169 ) Power supply
a c 107 à CPUs
a c 216 V Motherboard
March 3, 2014 2:10:10 PM

Aae 28 said:
Ok,ill tray it,but just for knowage,what is c6,c7 stat mean,and why most psu does not suppert it?


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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