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Question about PSUs for Haswell

post #1 of 10
Thread Starter 

I am building a new Rig around Haswell and I am wondering if there are specific PSUs that will be required for the new CPU or will any PSU work and be fine. 

 

I have not been following Haswell at all but I think I read somewhere i think it was enermax on facebook that said they are or have released new PSUs designed specifically for Hsswell CPUs

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post #2 of 10
An independent PSU or a PSU with a DC-DC secondary will "compatible" with Haswell C7 power state.

Lower-ends group-regulated PSU may have issues with it. Basically, this power state may keep the load of the +12v rail as low as 0.05A, and the whole scare is that the load on the minor 3.3/5v rails will affect the voltage of the +12v and have go out of spec (the higher the load on the 5v, the higher the voltage goes on the +12v). So when you put your computer to sleep and get out of it, the OVP protection of the PSU may trip off and your computer will not power up.

The thing is that it is unlikely that the load on the minor rail during this low power state isn't high enough to cause this problem anyways, so chances are, you don't have to worry even if it is not officially compatible (the testing methodology done by Intel and such is likely tested more in a worse case, unlikely scenario). If you do run into this problem, however, you should be able to disable this feature on the motherboard's BIOS.

Of course, you could just save yourself the hassle and get one of those those units stated in the first line. You may also benefit from the tighter voltage regulation with your overclocks.
post #3 of 10
Haswell introduces some super-low power CPU states, so theoretically if this is enabled, it goes there, and you don't have any drives, fans, graphics cards, or anything else pulling on +12 V, yet somehow simultaneously have a huge load on +5 V and +3.3 V (charging 20 cell phones?), if you have a lower-end group-regulated output power supply, you might be able to crossload it hard enough with that unbalanced +12 V vs. +5 V / +3.3 V distribution that it falls so far out of regulation that it shuts itself off.

More or less, you can forget about it. Anything is fine.
post #4 of 10
Thread Starter 

just wondering but is there a list of already released Haswell certified PSUs?

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post #5 of 10
As stated above, it would only be a potential issue if you were using a group regulated PSU and had unusually large loads on your minor rails.

The advanced power states are likely to be disabled by default anyway, so I wouldn't worry about it.
Quote:
Originally Posted by 4LC4PON3 View Post

just wondering but is there a list of already released Haswell certified PSUs?

I think each company has their own list.
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post #6 of 10
post #7 of 10
Quote:
Originally Posted by 4LC4PON3 View Post

just wondering but is there a list of already released Haswell certified PSUs?

Many of the major companies have already released a list of compatible PSUs. Here's a couple of ones I could find quickly:

Corsair
Seasonic

As for Rosewill, all the lines built by Super Flower (Capstone, Lightning, Tachyon, Silent Night) are Haswell-ready, as should the ATNG-built "Fortress".

EDIT: Ninja'd by qwan456! Oh well, that's OK.
Edited by svenge - 5/31/13 at 10:21pm
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post #8 of 10
Thread Starter 

I dont need anything super powerful. I am a single card user with no chance of ever going SLI or Crossfire.

 

Im going to go with this yes I can get the NON modular 650 for the same price but I want Modular this time around.

 

Rosewill CAPSTONE-550-M 550W

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182262


Edited by 4LC4PON3 - 5/31/13 at 10:36pm
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post #9 of 10
The Capstone 550-M is a very good model, it should serve you well.
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post #10 of 10
Quote:
Originally Posted by 4LC4PON3 View Post

I dont need anything super powerful. I am a single card user with no chance of ever going SLI or Crossfire.


Im going to go with this yes I can get the NON modular 650 for the same price but I want Modular this time around.


Rosewill CAPSTONE-550-M 550W

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182262

Its pretty much the best bang for buck PSU you can buy

Its a rebrand of the Super Flower Golden Green so its not a crappy unit
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