Haswell compatibility with Corsair power supplies

 

A report recently published over at the VR-Zone discussing the new 4th generation Intel Core processors, code-named "Haswell", and their ability to go into a lower power sleep state than any previous processor has caused some concern about PSU compatability with the new processor.

 

 

When an Intel Core (i3, i5, i7) processor is idle, it goes into a sleep state that requires less power than when the CPU is active. Since the motherboard voltage regulation modules that provide power to the CPU gets their power from the power supply's +12V rail, these sleep states can dramatically reduce the load on the power supply's +12V rail.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

While we are still working with Intel on the details of the testing methodology they use to check PSUs for Haswell compatibility, it is already known that a power supply that uses DC to DC for the non-primary rails (the +3.3V and +5V) will not have an issue with the new low power sleep states. This is because a DC to DC buck converter is used to convert +12V to +3.3V and +5V. This means that no matter what load the CPU puts on the power supply, there will always be a load on the +12V because the +12V is required to provide power to +3.3V and +5V.

Corsair utilizes this DC to DC technology in most of their power supplies. Starting with the CX750 and CX750M and moving all of the way through the GS Series, TX and TX-M Series, the HX Series, both the AX Series Gold and AX Series Platinum, and the new AXi Series. So whatever your budget, if you choose Intel's new Haswell processor and wish to utilize the new, low power C7 sleep state, Corsair has a power supply for you.

PSU Series
Model
Haswell
Compatibility
Comment
AXi
AX1500i Yes 100% Compatible with Haswell CPUs
AX1200i Yes 100% Compatible with Haswell CPUs
AX860i Yes 100% Compatible with Haswell CPUs
AX760i Yes 100% Compatible with Haswell CPUs
AX
(Gold and Platinum) 
AX1200 Yes 100% Compatible with Haswell CPUs
AX860 Yes 100% Compatible with Haswell CPUs
AX850 Yes 100% Compatible with Haswell CPUs
AX760 Yes 100% Compatible with Haswell CPUs
AX750 Yes 100% Compatible with Haswell CPUs
AX650 Yes 100% Compatible with Haswell CPUs
HXi
HX1200i Yes 100% Compatible with Haswell CPUs
HX1000i Yes 100% Compatible with Haswell CPUs
HX850i Yes 100% Compatible with Haswell CPUs
HX750i Yes 100% Compatible with Haswell CPUs
HX
(Silver, Gold and HX1000)
HX1050 Yes 100% Compatible with Haswell CPUs
HX1000 Yes 100% Compatible with Haswell CPUs
HX850 Yes 100% Compatible with Haswell CPUs
HX750 Yes 100% Compatible with Haswell CPUs
HX650 Yes 100% Compatible with Haswell CPUs
HX
(Legacy Bronze
and below)
HX620 TBD Likely compatible — currently validating
HX520 TBD Likely compatible — currently validating
HX650 TBD Likely compatible — currently validating
HX450 TBD Likely compatible — currently validating
TX-M
(All Versions)
TX950M Yes 100% Compatible with Haswell CPUs
TX850M Yes 100% Compatible with Haswell CPUs
TX750M Yes 100% Compatible with Haswell CPUs
TX650M Yes 100% Compatible with Haswell CPUs
TX550M Yes 100% Compatible with Haswell CPUs
RM
(All Versions)
RM1000 Yes 100% Compatible with Haswell CPUs
RM850 Yes 100% Compatible with Haswell CPUs
RM750 Yes 100% Compatible with Haswell CPUs
RM650 Yes 100% Compatible with Haswell CPUs
RM550 Yes 100% Compatible with Haswell CPUs
RM450 Yes 100% Compatible with Haswell CPUs
TX
(All Versions)
TX950 Yes 100% Compatible with Haswell CPUs
TX850 Yes 100% Compatible with Haswell CPUs
TX750 Yes 100% Compatible with Haswell CPUs
TX650 Yes 100% Compatible with Haswell CPUs
TX550 Yes 100% Compatible with Haswell CPUs
GS
(Current V3)
GS800 Yes 100% Compatible with Haswell CPUs
GS700 Yes 100% Compatible with Haswell CPUs
GS600 Yes 100% Compatible with Haswell CPUs
GS
(Legacy V2)
GS600 TBD Likely compatible — currently validating
GS500 TBD Likely compatible — currently validating
GS
(Legacy V1)
GS800 Yes 100% Compatible with Haswell CPUs
GS700 Yes 100% Compatible with Haswell CPUs
GS600 Yes 100% Compatible with Haswell CPUs
GS500 TBD Likely compatible — currently validating
CS-M
CS850M Yes 100% Compatible with Haswell CPUs
CS750M Yes 100% Compatible with Haswell CPUs
CS650M Yes 100% Compatible with Haswell CPUs
CS550M Yes 100% Compatible with Haswell CPUs
CS450M Yes 100% Compatible with Haswell CPUs
CX-M
CX850M Yes 100% Compatible with Haswell CPUs
CX750M Yes 100% Compatible with Haswell CPUs
CX600M TBD Likely compatible — currently validating
CX500M TBD Likely compatible — currently validating
CX430M TBD Likely compatible — currently validating
CX
CX750 Yes 100% Compatible with Haswell CPUs
CX600 TBD Likely compatible — currently validating
CX500 TBD Likely compatible — currently validating
CX430 TBD Likely compatible — currently validating
VX
(Legacy)
VX450 TBD Likely compatible — currently validating
VX550 Yes 100% Compatible with Haswell CPUs
VS
VS650 TBD Likely compatible — currently validating
VS550 TBD Likely compatible — currently validating
VS450 TBD Likely compatible — currently validating
VS350 TBD Likely compatible — currently validating

Alternately, you can visit Intel's "PSU Selector Tool" located here.

To filter the PSUs that are considered by Intel to be "Haswell Ready", start by changing the value of the "12V2 Min-load 0A" to "Yes".

As we work with Intel over their Haswell testing methodology and discuss with motherboard manufacturers about the different ways they may address potential compatibility problems with power supplies, we will keep you updated right here on this blog.  We will also continue to test legacy product (discontinued product) and keep the list updated in this way as well.

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Comments

  • Stephen Einson's gravatar Stephen Einson said:
    9/10/2014 12:15 PM

    Extremely useful chart in configuring a new build with Haswell chips. Should be upgraded now that Intel has released the Haswell -e series.

  • Aaik373m@gmail.com's gravatar Aaik373m@gmail.com said:
    11/13/2014 6:15 AM

    m section than it. <a href="http://www.mediaplusbv.com/" title="Ugg Outlet">Ugg Outlet</a>

  • Roberto Castellano's gravatar Roberto Castellano said:
    11/26/2014 7:31 AM

    Why there are a lot of models that are still in TBD (Likely compatible — currently validating) . Is one Year not enough to validate them? best regards Robertoivs

  • Inspiro's gravatar Inspiro said:
    12/11/2014 9:53 AM

    corsair vs 650 is NOT haswell ready

  • Pedro's gravatar Pedro said:
    12/12/2014 5:29 PM

    VS550 is not ready. Bought a i7-4790. Result: constant reboots.

  • John's gravatar John said:
    12/16/2014 1:14 PM

    I found this list only after, I started experiencing Asus power surge reboots. I have VS650 with i5 4670. But this list says VS650 is likely compatible with haswell, when can we have a concrete answer? Also how can I claim return VS650 for a compatible product? I am kinda lost here.

 
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