What the benefit gain from Haswell sleep state C7 ???

Libero · Oct 10, 2014

I heard that there is important to get the PSU with "Haswell-Ready" or Haswell Support Certified if people buy Haswell CPU... Also I heard that non-compatible PSU to Haswell still can support the CPU just by disable the C7 state in the BIOS... So what the advantages of Haswell sleep state C7 by technically and economically either to CPU system or end-user? And which one is better either to use Haswell Certified PSU with enabled C7 or non-Haswell Certified PSU by disabled C7 from the BIOS?

Update : As you all can view my current computer setup that it kind an old one. I plan to buy new PC so this build in my mind for now :-

Intel Core i5-4690 CPU
Memory 2x4GB DDR3 PC1600 RAM
Asus H97M-E Mobo
Storage HDD 500GB
GPU Asus GTX 760 GDDR5 2GB DCU II OC
Samsung Optical Drive
PSU Seasonic M12II 750 - http://www.newegg.com/Product/Product.aspx?Item=N82E16817151107

So what you think about the PSU... It is allright? or you can suggest me others?
Thanks in advance...

Darkbreeze · Oct 11, 2014

I would just disable it, that's what most people do. Here's some information about it though just FYI.

Before we proceed, we should be clear about one thing: you don't, strictly speaking, need one of these "Haswell-ready" PSUs to build a Haswell system. Corsair told us that it "fully expects" motherboard makers to let users disable the new low-power power state in the firmware. Cooler Master went even further, stating that, to its knowledge, "all mainboard vendors" will disable the new low-power state in their boards by default. In other words, you may never encounter any issues even if you pair a Haswell platform with an incompatible power supply.

That said, Haswell's lower-power sleep state is one of the perks of the new platform. Compared to the prior generation, it cuts minimum sleep power consumption from 6W to about 0.6W. Those kinds of power savings may not add up to much on your power bill, and they probably aren't worth the price of a brand-new PSU. However, if your current unit is already compliant, you might as well enjoy the reduction in sleep power. Also, of course, folks building a Haswell system from scratch are better off getting a compatible unit to begin with.

Darkbreeze · Oct 11, 2014

I'd definitely make some changes to that future build when the time comes. You're selling yourself short in several areas. No big deal though, easy to do. And that's an excellent PSU.

Libero · Oct 11, 2014

Darkbreeze :

Yeah I already read about this article HERE before post this thread which I want to get some reviews about it. I think that by disable C7 because non-certified PSU make the Haswell CPU's system looks like not perfect LOL.

Darkbreeze :

Yeah actually there is another PSU recommended to me on another thread I post before I noticed that it Haswell non-certified one... I think it better to get Haswell's certified PSU for my new future PC.. Maybe also 1TB HDD for better storage...

Darkbreeze · Oct 11, 2014

Seasonic is one of the best PSU manufacturers in the world. Not only are they one of the few brands that really doesn't have a poor quality PSU series but they also make PSUs for a number of other top brands. Seasonic makes PSUs for Antec, Arctic cooling, BeQuiet, XFX, and some of the models by Cooler Master, Corsair, NZXT, PC Power and Cooling and Silver Power. You can see who makes what for each different series of PSU here:

http://www.tomshardware.com/reviews/power-supply-psu-brands,3762.html

The M12 II you have picked out is among one of the most trusted models there is.

I would definitely go with a bigger hard drive, or maybe a bigger drive and an SSD. You would be missing out on a significant speed increase in had disc access for reading, writing and seeking.

You might also consider going with the ATX form factor H97-Plus over the Micro-ATX H97M-E since the smaller version does not support Crossfire if you decide to add another card later. If you have no plans to add a second card in the future then the smaller board is ok.

I'm guessing you already know you can't overclock that processor since it's not a K model. Those i5 Ks kick a nice performance boost from even medium-ish overclocks but it's not essential.

Libero · Oct 11, 2014

Darkbreeze :

Seasonic is one of the best PSU manufacturers in the world. Not only are they one of the few brands that really doesn't have a poor quality PSU series but they also make PSUs for a number of other top brands. Seasonic makes PSUs for Antec, Arctic cooling, BeQuiet, XFX, and some of the models by Cooler Master, Corsair, NZXT, PC Power and Cooling and Silver Power. You can see who makes what for each different series of PSU here:

http://www.tomshardware.com/reviews/power-supply-psu-brands,3762.html

The M12 II you have picked out is among one of the most trusted models there is.

I would definitely go with a bigger hard drive, or maybe a bigger drive and an SSD. You would be missing out on a significant speed increase in had disc access for reading, writing and seeking.

You might also consider going with the ATX form factor H97-Plus over the Micro-ATX H97M-E since the smaller version does not support Crossfire if you decide to add another card later. If you have no plans to add a second card in the future then the smaller board is ok.

I'm guessing you already know you can't overclock that processor since it's not a K model. Those i5 Ks kick a nice performance boost from even medium-ish overclocks but it's not essential.

Yes I choose the PSU from the Tier 1 at The Power Supply Unit Tier List and compatible with Haswell support certified.
Yes all the parts I pick base on my need and budget.

Darkbreeze · Oct 11, 2014

Ok. Good luck to you.

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