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Parts have arrived- second guessing my PSU's 12v rail(s) Amps (if I have enough headroom)

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August 1, 2013 6:57:59 AM

Well 90% of my parts have arrived by mail, and I'm itching to get started on building the beast..but

I'm concerned with my PSU size. I ran a wattage calc. on Asus website, and @ http://extreme.outervision.com/psucalculatorlite.jsp

The Asus requirement is almost 200watts more than the other calculator, but they're both within range.

My main concern is the 12v amps.... The GTX770 recommends 42, and the Seasonic M12II has 48 available (within range...but cutting it closer than I should it seems?)

My setup is as follows:

CPU Intel Core i5-4670K 3.4GHz Quad-Core
CPU Cooler Noctua NH-D14 65.0 CFM
Motherboard Asus Maximus VI Hero ATX LGA1150
Memory Mushkin Blackline 8GB (2 x 4GB) DDR3-1600
Storage Samsung 840 Pro Series 128GB 2.5" SSD
Western Digital Caviar Black 2TB 3.5" 7200RPM
Video Card EVGA GeForce GTX 770 2GB
Case Cooler Master Storm Enforcer ATX Mid Tower
Power Supply SeaSonic 620W ATX12V / EPS12V
Optical Drive Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
Monitor Asus VG248QE 24.0"
Keyboard Razer Blackwidow Ultimate 2013
Mouse Corsair Vengeance M65 Wired Laser

Secondly....I read all about the Haswell CPUs low power state that can trip PSU's that aren't designed to deliver such a small trickle power..is this something I should be concerned about with the SeaSonic M12II? I would like to utilize it I supposed, but if I don't enable it on my MOBO, I should be A-OK right??

I'm debating sending the M12II back and getting a Corsair HX750 to just forget about the above issues....let me know if I'm overthinking this please!


a c 279 Ĉ ASUS
a c 1979 ) Power supply
August 1, 2013 7:00:08 AM

The M12's are Haswell certified , stick with it.

Plenty of power and certified.
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a b Ĉ ASUS
a b ) Power supply
August 1, 2013 7:01:51 AM

The current Seasonic will meet your needs. No worries.
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a b ) Power supply
August 1, 2013 7:07:52 AM

The m12II 80+ bronze. With a 770 600w is a safe minimum. Your fine but if you would rather get a high end unit (never a bad idea) get a 750w X series from XFX/Seasonic (cheaper from XFX cant remember the exact model it's their only 80+ gold line). Both are the same exact unit as the Corsair HX only $20 cheaper.
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August 1, 2013 7:56:31 AM

Perfect- you guys rock. I'll pick a solution when the thread slows down.

I like the thought of some extra headroom, but I am dying to put this thing together, so I'm going to stick with the M12II now that I have your check of approval.

Now I have to sift through the UPS sticky's and research a nice match for the M12II. Any quick suggestions?

Thanks again
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a c 279 Ĉ ASUS
a c 1979 ) Power supply
August 1, 2013 8:00:37 AM

Stick with the M12 it's a great unit, what would you like to match it with?
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August 1, 2013 8:08:24 AM

I'd like to match it with a compatible UPS or surge protector that has a solid reputation. I haven't read enough of the UPS lore to make a confident decision yet. I know there are some compatibility issues with Active PFC power supplies & certain UPS's, and I'm still a little fuzzy on what size UPS I'll need with a 620W PSU.

*and the reason I was doubting the 620 compatibility with Haswell is because the larger capacity M12 series PSU's are listed as "4th Gen Haswell Compat" on NewEgg & a few of the threads found within the PSU Faq's here on Tom'sHardware- but the 620 is not? Just an oversight I guess?
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a c 279 Ĉ ASUS
a c 1979 ) Power supply
August 1, 2013 8:14:36 AM

You are correct not the m12 620 it was the 650.
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August 1, 2013 8:32:06 AM

Bahh, guess I will need to send it back. As I understand it, most MOBO's come with the Haswell low-power sleep function disabled, so there may be no conflict unless I enable it. But realistically, it sounds like a nice benfit that I should try to utilize?
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a b ) Power supply
August 1, 2013 9:03:42 AM

90% of modern PSU's have no problems with the Haswell low power. It's just with some very old, very cheap units that you have problems with. I don't know how it got around that only a select few units will work. That 620w Seasonic unit is even certified to work with Haswell, as is the 520w.
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August 1, 2013 9:10:33 AM

Thanks Mace200200 - Where did you find the certification? It's not on their website, or anywhere I can find.

I believe you! I just cannot find it anywhere
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Best solution

a c 279 Ĉ ASUS
a c 1979 ) Power supply
August 1, 2013 9:12:54 AM

http://www.seasonic.com/new/twevent20130510.htm

These are the current Haswell certified units ^
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a b Ĉ ASUS
a c 1176 ) Power supply
August 1, 2013 9:19:11 AM

mace200200 said:
90% of modern PSU's have no problems with the Haswell low power. It's just with some very old, very cheap units that you have problems with. I don't know how it got around that only a select few units will work. That 620w Seasonic unit is even certified to work with Haswell, as is the 520w.


Seasonic doesn't claim that the SS-620GM is Haswell READY!

Where's this certification that you speak of? It's not on Intel's own list.
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August 1, 2013 9:55:29 AM

Sorry to stir up a debate- I just wanted to verify that the M12II 620 Bronze was not compatible. As I initially suspected, it's not- although I could probably still use it but wouldn't be able to activate the Haswell low power state sleep mode.

It sounds like I know what I need in terms of 12V amps, PSU wattage etc....so maybe I will indeed send the Bronze back and go with one of the above recommended, Haswell compatible, PSUs. Shipping the M12II back is probably not going to be cheap..meh
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a b Ĉ ASUS
a c 288 ) Power supply
August 1, 2013 11:19:52 AM

draynh33 said:
Well 90% of my parts have arrived by mail, and I'm itching to get started on building the beast..but

I'm concerned with my PSU size. I ran a wattage calc. on Asus website, and @ http://extreme.outervision.com/psucalculatorlite.jsp

The Asus requirement is almost 200watts more than the other calculator, but they're both within range.

My main concern is the 12v amps.... The GTX770 recommends 42, and the Seasonic M12II has 48 available (within range...but cutting it closer than I should it seems?)

My setup is as follows:

CPU Intel Core i5-4670K 3.4GHz Quad-Core
CPU Cooler Noctua NH-D14 65.0 CFM
Motherboard Asus Maximus VI Hero ATX LGA1150
Memory Mushkin Blackline 8GB (2 x 4GB) DDR3-1600
Storage Samsung 840 Pro Series 128GB 2.5" SSD
Western Digital Caviar Black 2TB 3.5" 7200RPM
Video Card EVGA GeForce GTX 770 2GB
Case Cooler Master Storm Enforcer ATX Mid Tower
Power Supply SeaSonic 620W ATX12V / EPS12V
Optical Drive Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
Monitor Asus VG248QE 24.0"
Keyboard Razer Blackwidow Ultimate 2013
Mouse Corsair Vengeance M65 Wired Laser

Secondly....I read all about the Haswell CPUs low power state that can trip PSU's that aren't designed to deliver such a small trickle power..is this something I should be concerned about with the SeaSonic M12II? I would like to utilize it I supposed, but if I don't enable it on my MOBO, I should be A-OK right??

I'm debating sending the M12II back and getting a Corsair HX750 to just forget about the above issues....let me know if I'm overthinking this please!


Hi - what is the actual model # of you M12 620 - the newest model is Haswell Cert
the older one is not.

SS-620GM2 - is Haswell cert
(Evo Edition)

SS-620GM - is not Haswell Cert






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a b Ĉ ASUS
a c 1176 ) Power supply
August 1, 2013 11:37:21 AM

Seasonic has two M12II Bronze Series.

There's the old M12II Bronze Series (e.g. SS-620GM) and then there is the new M12II Bronze EVO Edition Series (e.g. SS-620GM²).

The SS-620GM² isn't on Newegg's site yet.
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a b ) Power supply
August 1, 2013 5:13:34 PM

ko888 said:
mace200200 said:
90% of modern PSU's have no problems with the Haswell low power. It's just with some very old, very cheap units that you have problems with. I don't know how it got around that only a select few units will work. That 620w Seasonic unit is even certified to work with Haswell, as is the 520w.


Seasonic doesn't claim that the SS-620GM is Haswell READY!

Where's this certification that you speak of? It's not on Intel's own list.


All the articles I read about this just before and just after Haswells release say exactly that.
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