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URGENT! Does the ASUS P7H55 MoBo require the -5V pin?


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#1
Parameter

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I still have time to cancel my order for the ASUS P7H55 MoBo ( http://www.asus.com/...#specifications ) so please help ASAP.

The question is quick - does this MoBo require ALL pins on the PSU's 20+4pin connector? I just got the PSU (Corsair CX500 V2) and there's one cable missing in the main connector. I've read that it's the optional -5V rail, but "some older motherboards" require it. Now, I know how quickly something can be called "old" on this market, so is the ASUS P7H55 "old" in this matter? Seems quite new to me as the Core i3/i5/i7 CPUs for which it's been created are new, right? :)

Thanks in advance
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#2
admin

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According to the picture and documentation it does:

1 x 24-pin EATX Power connector
1 x 4-pin ATX 12V Power connector


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#3
phillpower2

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Hi Parameter
Your MB and PSU are compatible so no worries.

Connectors 1 x Main connector (20+4Pin) This is one lead that has a 20 pin + a 4 pin connector, they are used together to make a 24 pin connection in the case of your MB or the 20 pin only for earlier MBs.
1 x 4+4 Pin EPS 12V This connection can be used either as a single 4 pin ATX connection on older MBs or as 2 together to make an 8 pin ATX connector which some newer MBs require quad core CPUs etc in particular.
2 x PCI-E
5 x SATA
4 x Peripheral
1 x Floppy
I hope this answers your question but let us know either way.
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#4
Parameter

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Thanks for the info, I think I didn't say it clear. I know that basically, the MoBo and the PSU use the same standard, but there's one missing cable in the PSU's 24-pin connector. Each pin is connected to one small cable except for one (pin #18 - from what I've found according to this: http://pinouts.ru/Po...v2_pinout.shtml it's pin #20) which apparently is supposed to carry the -5V (through the white wire) which are optional in the newest standards.

Now, yes the MoBo requires a 24-pin connector, but won't the lack of this one pin/-5V cable be a problem? Does this particular MoBo need these -5 Volts?

---------EDIT---------

See here:
http://www.tomshardw...power-connector

On this guy's picture, it's the one pin in the bottom row of the 20-pin connector, 3rd from the left. They told him not to worry, but then - I've chose the P7H55 because of it's good backwards compatibility (as in - more than one standard PCI slot) so if it's considered "old" and does indeed need this -5V rail...? :)

Edited by Parameter, 30 August 2011 - 04:52 PM.

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#5
phillpower2

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Hi Parameter

20 -5V White -5 VDC (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units)

Meaning as yours is a later release MB it is not required, good quality PSUs are designed to be backward compatible as is the case with yours.
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#6
Parameter

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Thanks for the info. The MB's on its way already, but this gave me a thrill for a while :unsure:

I've been a bit out of date and although I've gathered enough info in the recent weeks/months before making the final choice for the new hardware, it's the first time I've heard of the empty pin, but yeah, if it's really necessary for AT class :) then all worries are gone, I'm not building a 486.


Thanks again!

Case closed... and well ventilated :yes:
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#7
phillpower2

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You are welcome we are happy to have been able to help :unsure:
Good luck with the new build, let us know how it goes or if we can assist in any way :)
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#8
Parameter

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You are welcome we are happy to have been able to help :unsure:
Good luck with the new build, let us know how it goes or if we can assist in any way :)

Well... if I'd had to make a "what can possibly go wrong" list, I could write a book with all problems that I can think of, but I would NEVER suspect something like this:
http://www.geekstogo...an-a-mobo-hold/

Yes, I do have these plastic... thingies (standoffs) in my old PC and NO, looking at the tiny metal "screw-extensions" did NOT give me the idea that these little thing are supposed to carry the weight of the MoBo as standoffs. This + not one word about it in any manual gave me some headache.

BUT... it's done :) I'm writing this from my new machine. Everything works, all systems clear, Core temperature at 35°C.

One word - WOW! :yes: After 10 years of stuttering scrolling through websites, stuttering YouTube videos, saving the life of my Pentium 4 which heatsink bracket broke off leaving if literally hangin on one bracket with almost no contact with the CPU and a couple of days running at 95°C (it's still working, BTW) and 3 years of torturing a GeForce 3 card at 1920x1080 resolution ... finally, my computer isn't the bottleneck of my working speed :) Can't wait to launch PhotoShop with 1GB DDR3 RAM on the GFX card (comparing to 64MB RAM on the old one).

And the fresh smell of air flowing through a new circuit board... ahh... priceless ;) ...or rather... ~$500, for that matter :)

There are downsides, though - I feel like a stranger in Windows 7. Where is... everything? It looks so pretty, but... it's not there ;)
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#9
phillpower2

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Enjoy :) and thanks for the update
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