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PSU issue?


SV5FRZ

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Hi guys,

I'm a system builder and I've recently built a PC for a client using some ASUS and some Corsair parts.

The PC is having the same abovementioned problem, and as a result I contacted ASUS support. I'll paste the email conversation below along with the specs of the computer.

 

First the problem.

The BIOS loses some settings after the power is pulled from the PSU. It will not lose the OC profiles, nor the time.

I have replaced the battery, and tested both the original and new batteries, which are both fine.

Installing any other cheap PSU - strangely fixes the problem, and the AX850 in this PC does work perfectly everywhere else...

 

 

Let me note that the system works perfectly otherwise. Even with the 1600MHz DDR3 working at XMP Profile 1, the system is really fast and stable. There wasn't anything I could throw at it that would make it falter.

 

 

Specs:

Intel Core i7 950 3.06GHz - Box

ASUS Sabertooth X58

6Gb Corsair DDR3-1600 - TR3X6G1600C8

ASUS ENGT430 1Gb

60Gb Corsair Force F60 SSD

2x 2Tb WesternDigital Caviar Green - WD20EARS

2x LG GH22LS50

CoolerMaster HAF-922

Corsair AX850

CoolIT Eco A.L.C.

27" Samsung SyncMaster P2770HD

Microsoft Wired Keyboard 600

Logitech G500

Creative Inspire T6160

1250VA Eaton Nova AVR Line Interactive

Windows 7 Ultimate x64

 

 

ASUS Support ticket:

 

Email 1: ID - WTM201012151646238334

 

Hi there,

My problem is that the motherboard loses its settings every time the power is

completely removed from the system.

It is the same problem described in this forum:

http://vip.asus.com/forum/view.aspx?board_id=1&model=Sabertooth%20X58&id=20101106170217762&page=6&SLanguage=en-us

 

I am also using the Corsair AX850 PSU in this setup.

 

It would be really counter-productive to have to switch to a lesser PSU in order to fix

this issue. Please let me know what needs to be done in order to resolve it.

Thanks

Dear customer,

Please try to test the system with another ac supply.

If the problem persist please try to contact the Greek support at the n. 00800 44142044 (toll-free) (09am to 13pm - 14pm to 19pm, Monday to Friday)

 

Best regards

ASUS HELP DESK

 

 

Email 2: ID - WTM2010121625518518

 

From what other people have tried in this issue, I'm sure that the system will work with

a different PSU.

But that is NOT a solution. There is no reason why I shouldn't be able to use this top

quality PSU with this motherboard.

I need a way to fix the problem and still use the same PSU.

Thanks

 

Dear customer,

 

There is a compatibility problem with this PSU. In a future version of BIOS could be resolved this problem.

 

Best regards

ASUS HELP DESK

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  • Corsair Employee

SV5FRZ,

 

Are you able to duplicate the same issues on any other motherboards or systems? We always have the option of replacing the unit for you, but from the response from Asus it sounds like they may be aware of a glitch with their BIOS, and a fix will ultimately have to come from there.

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I wasn't able to duplicate the issue on the motherboards that I tested, although I didn't test the ASUS P6X58D motherboard mentioned by CalA.

I tried some Gigabyte and some ASRock motherboards that I had available for testing.

 

There are two things that I noted about the AX850 that perhaps you could verify as normal or not.

1. When the computer powers on, I can hear a relay switch "click" from the PSU. I say this because it's the first time I hear a PSU do that.

2. The fan of the PSU remains completely OFF for long periods of time. Most of the time it doesn't even start at startup. I had to run the CPU and GPU at 100% for some time in order to get that fan to start running.

 

But then again, I have stress-tested this system with a couple different utilities, and it was exceptionally stable. The customer uses it for Photoshop CS5 and Sony Vegas video encoding, and he hasn't had any problems whatsoever. It runs just fine. I would assume that if the PSU was faulty, it would've caused some instability to the system.

 

For now, I have saved the BIOS config to O.C. Profile 1, and the customer is kind enough to load that profile each time power is completely drawn from the PC. He does have a UPS, so that doesn't happen very often.

 

Edit

So my thought was this: If I contact ASUS about a problem, it's one thing. But it's a totally different story if a company like Corsair did it.

This issue should be a mutual concern since there will be many builders who will be keen to use high quality ASUS parts along with this top quality Corsair PSU.

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The behavior you mention is normal for the AX850. The AX series fans will not spin 100% of the time, only when its needed. I have raised this compatibility concern up to our PSU engineers and they are looking into it.
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I was looking at some photos of the PC yesterday, and it got me wondering. Would it be possible for me to plug the ATX and/or the 8pin CPU power connectors in the wrong sockets of the PSU? And if that were true, would it matter?
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I was looking at some photos of the PC yesterday, and it got me wondering. Would it be possible for me to plug the ATX and/or the 8pin CPU power connectors in the wrong sockets of the PSU? And if that were true, would it matter?

 

It should not be possible to plug the cables into the incorrect slots on the PSU.

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