Does Haswell / Z87 require a new power supply?

[rgames]

I've seen it mentioned that the Z87 / Haswell boards require a new power supply connection in order to make use of the low-power states. However, I can't seem to find any info on what power supplies provide that capability.

I bought a Seasonic SS-660XP2 a few months ago and am wondering if it will work with a Haswell system and allow the low-power states.

Thanks,

rgames

 

[LagunaX]

Seasonic has a list on their website.

 

[IGemini]

Direct link to said list:
http://www.seasonicusa.com/news28.htm

Yes, Haswell is compatible with the Seasonic Platinum.

 

[rgames]

Thanks for the info. Weird that they don't mention the compatibility on the product page.

Do the Haswell boards have different power connections? I'm not sure that my PSU came with connectors different than what previous motherboards use.

rgames

 

[lehtv]

Do the Haswell boards have different power connections? I'm not sure that my PSU came with connectors different than what previous motherboards use.

Nah, the point is that Haswell CPUs run at such a low power state on idle that some PSUs don't support such a low load via the CPU power cable

 

[pcunite]

I thought the low-power states were disabled for desktop parts?

 

[rgames]

Nah, the point is that Haswell CPUs run at such a low power state on idle that some PSUs don't support such a low load via the CPU power cable

OK - so the connections are the same but the electronics in the PSU are different. Do I understand that correctly?

What would happen if you tried using an incompatible PSU with a Haswell board - would it just not boot? Or would it just never drop to the low-power states? How would it know not to drop to the low power states?

Thanks again,

rgames

 

[jonnyGURU]

It won't return from sleep. C6 and C7 sleep states is when the power drops so low that the PSU assumes there's no load on the +12V and shuts off.

The reason why some PSUs work and some don't is because most PSUs these days use DC to DC for the +3.3V and +5V, so even if the +12V drops because of the CPU's sleep state, there's always a load on the +12V because of the DC to DC conversion for other things in the PC.

 

[ControlD]

So if I am reading this correctly, the solution to that problem would be to disable C6/C7 in the BIOS if you have an older, non compatible power supply?

 

[BFG10K]

So if I am reading this correctly, the solution to that problem would be to disable C6/C7 in the BIOS if you have an older, non compatible power supply?

Yup, and AFAIK the setting is disabled by default anyway.

Another work-around is to hook up a single system fan so there's always a slight load on the 12V.

 

[saad_ahmed]

You should check the power rating of both.

 

[JimmiG]

Most likely, it will work anyway. You probably have something else on the 12V rail like a few fans, hard drives etc. so it will never at 0. My trusty old VX 450W from 2008 works great, even with the C-states enabled.

Worst case, you disable the new C-states and the CPU uses about 2-3W more at idle, no change at full load.

 

[fb02521]

Most likely, it will work anyway. You probably have something else on the 12V rail like a few fans, hard drives etc. so it will never at 0. My trusty old VX 450W from 2008 works great, even with the C-states enabled.

Worst case, you disable the new C-states and the CPU uses about 2-3W more at idle, no change at full load.

I just build 4670k + Asus Z87 pro system using 2008 top of line Seasonic 500W PS.

-MB chipset overheated and blew up according to Asus rep--My Q thus was whether this overheating of chipset might be related to use of the non-Haswell PS?

 

[royo]

Most likely unrelated to the PS.

 

[hackerballs]

yes, not related