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Intel Haswell sleep state and PSU compatibility?

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  • Power Supplies
  • Intel
  • Chip
  • CPUs
  • Power Consumption
  • Compatibility
Last response: in CPUs
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September 19, 2014 7:39:14 PM

Hey there, while I'm on the wait for Broadwell with a Z97M board already bought and tested I got offered from a friend an used i7 4770K for a great deal $250, I'm really considering it since the reason I'll be moving to Intel is because of its less power consumption/performance than AMDs, and i5 Boardwell chip will definitely do the job for me but seeing how cheap it the i7 I can't go wrong with that either... so looking around to see if Corsair CX500W was enough (definitely is) for it I found this article from the corsair website that it might not be compatible with Haswell chip, while I know this is enough (500w) for the chip I read that disabling the sleep state thing will make it work just fine, but what does exactly it do? (mostly for the people who has this chip), won't the CPU reduce its power consumption when is on IDLE if the sleep state is disabled? or will the system hang or something like that when is on IDLE?

Sorry for my ignorance but I'm not experienced with some electrical terms, I don't really want to buy another PSU (probably $80+) just for its support either, that would be no longer a deal for me. As for why a K chip and Z97 chipset if I'm concerned about power consumption, Yes I won't be overclocking but simply put, I'd want to have that extra power for when I need it in the future without going with expensive upgrades. ;) 

btw the GPU I will be running with it is a GTX 760 if anyone want to know.

More about : intel haswell sleep state psu compatibility

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September 21, 2014 1:01:54 AM

As of yet, Corsair has not announced, even to this day, whether the CX500 PSU's are Haswell compatible or not. Their charts still say to be determined which I'm assuming means no. You should however be able to turn off the C6 and C7 states in the BIOS settings though on compatible motherboards. If disabled, the C states should not cause further problems with PSU's not capable of responding to the appropriate state changes. Furthermore, that shouldn't really affect your power consumption, or lack thereof, to any degree which will be appreciable.
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September 21, 2014 6:27:53 PM

darkbreeze said:
As of yet, Corsair has not announced, even to this day, whether the CX500 PSU's are Haswell compatible or not. Their charts still say to be determined which I'm assuming means no. You should however be able to turn off the C6 and C7 states in the BIOS settings though on compatible motherboards. If disabled, the C states should not cause further problems with PSU's not capable of responding to the appropriate state changes. Furthermore, that shouldn't really affect you power consumption, or lack thereof, to an degree which will be appreciable.

Awesome man thanks for the reply, I'll definitely disable it as long as I can until I can afford one of those 100% compatible PSU... but what kind of problem would I be facing if I don't disable the low power states, would my system hang or something like that?
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a b ) Power supply
a b å Intel
a b à CPUs
September 21, 2014 6:40:25 PM

Most likely you would experience system hangs and freezing when trying to leave the sleep states. This PSU is Haswell compatible, fully modular and is an XFX unit made by Seasonic.

PCPartPicker part list / Price breakdown by merchant

Power Supply: XFX XTR 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($69.99 @ Newegg)
Total: $69.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-21 21:36 EDT-0400
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September 21, 2014 7:06:48 PM

Ok, man thank you for the help will keep that power supply on my wish list then.
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