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Guru3D.com » News » Intel Haswell low power states could require a new PSU

Intel Haswell low power states could require a new PSU

by Hilbert Hagedoorn on: 04/29/2013 02:41 PM | source: | 27 comment(s)
Intel Haswell low power states could require a new PSU

If you get your freak on by an extreme low power state you may need to get a new power supply if you want to use the new C6/C7 low power states of Intel's upcoming Haswell processors. These new power states require a power supply that can maintain a minimum current load of 0.05A on the CPU exclusive 12V2 rail. 

The previous ATX12V v2.3 design guidelines called for a minimum load of 0.5A on the CPU power rail, so a lot of older and budget power supplies will likely not meet the new specification, resulting in stability or shutdown issues once the system enters the C6/C7 power state.

Unfortunately, there's no way to know which power supplies are fully Haswell compliant as PSU manufacturers do not usually report the minimum load on their specification sheets.
Older or bargain basement power supply units may be unable to achieve this, and might become unstable or trigger a UVP/OVP shutdown once the system enters the C6/C7 power states. This is because the previous ATX12V v2.3 design guidelines for Ivy Bridge and its predecessors only called for a minimum load of 0.5 Amps on the CPU power rail, hence a less sophisticated internal feedback loop/protection could be used in older or cost-reduced offerings, which will not support the new standards.

Most worryingly, PSU manufacturers (even the enthusiast grade ones) do not usually report the minimum load on their spec sheets, so it is virtually impossible for us to come up with a list of supported units at this time. To ensure a smooth transition, mainboard designers and system integrators have been told to implement a BIOS-level toggle to enable/disable the new C6/C7 power states.







« Guru3D Rig of the Month - April 2013 · Intel Haswell low power states could require a new PSU · Wanna keep using Windows Live Messenger ? »

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CPC_RedDawn
Senior Member



Posts: 9803
Joined: 2008-01-06

#4586646 Posted on: 04/29/2013 02:41 PM
Screw using low power designs! OVERCLOCK LIKE A BEAST!!!! :P

-Tj-
Senior Member



Posts: 17868
Joined: 2012-05-18

#4586650 Posted on: 04/29/2013 02:46 PM
hmm, hopefully it wont be a issue

kens30
Senior Member



Posts: 1226
Joined: 2008-10-08

#4586675 Posted on: 04/29/2013 03:23 PM
They are introducing even lower power states in Haswell?well for laptops and tablets it will be a nice feature to prolong battery life but seriously their desktop cpu's should have an option on motherboard's bios to disable these new C6/C7 low power states if they are going to be an issue with your power supply,A lot of power users have invested in expensive top class PSU's it would be frustrating for who ever will be upgrading to the new platform and find out that they don't meet the those requirements.

Kaleid
Senior Member



Posts: 2763
Joined: 2004-02-02

#4586681 Posted on: 04/29/2013 03:34 PM
I'm for extremely low power usage, it needs to become more of a norm.

Pill Monster
Senior Member



Posts: 25214
Joined: 2007-08-23

#4586683 Posted on: 04/29/2013 03:35 PM
I don't believe it. AMD FX processors can use C6 without requiring a new PSU....

Also vr-zone doesn't mention a source for this info; any article that begins with "According to our sources" should be taken with a grain of salt imho.....

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