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asus sabertooth x79-after turning off the PSU,do i need to wait for mobo's green light to dissapear before plugging something?

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July 18, 2013 3:03:50 AM

Hi

After turning off the pc, do i need to remove the power cable and wait for green light to dissapear to safely connect/disconnect fans? what usuall operations on the motherboard are likely to cause a short when the green light is on (PSU turned off). I assume that the same operations would not cause a shord when the mobo is completely without any electricity (green light on mobo off)


I always disconnect power cable and wait for the green light to turn off , but afterwards i have to reset bios (a problem i have with my PC setup...) so i am wondering do i HAVE to do it that way all the time?

Best solution

a b V Motherboard
July 18, 2013 3:44:46 AM

Yes, wait for it to go off.
It turns off when all energy stored in capacitors is gone. Then you can be sure that you won't cause any shorts.

Connecting / disconnecting fans is a reltively safe operation and probably could be performed even on a running system. But why take a risk?
There is always a chance that you will short something accidentally.
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a c 100 V Motherboard
a b Ĉ ASUS
July 18, 2013 3:46:44 AM

Which device are you removing from the board or plugging in once you turn off the PSU? How is the sysem setup, is it overclocked or running at stock? Do you still have to clear CMOS if you don't remove any devices during AC power down?

There is some residual charge left in the capacitors (all motherboard ones and the PSU) when you switch off the PSU, and the onboard LEDs will fade out as this is dissipated. I am wondering why this s related to your situation, so some more info about what you are doing and how the system is setup would help.

-Raja
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July 18, 2013 4:28:54 AM

piotrek255 said:
Hi

After turning off the pc, do i need to remove the power cable and wait for green light to dissapear to safely connect/disconnect fans? what usuall operations on the motherboard are likely to cause a short when the green light is on (PSU turned off). I assume that the same operations would not cause a shord when the mobo is completely without any electricity (green light on mobo off)


I always disconnect power cable and wait for the green light to turn off , but afterwards i have to reset bios (a problem i have with my PC setup...) so i am wondering do i HAVE to do it that way all the time?


raja@asus said:
Which device are you removing from the board or plugging in once you turn off the PSU? How is the sysem setup, is it overclocked or running at stock? Do you still have to clear CMOS if you don't remove any devices during AC power down?

There is some residual charge left in the capacitors (all motherboard ones and the PSU) when you switch off the PSU, and the onboard LEDs will fade out as this is dissipated. I am wondering why this s related to your situation, so some more info about what you are doing and how the system is setup would help.

-Raja




i did not OC anything, and i did not change the bios, only updated it to latest version 4005 :

asus sabertooth x79 (i got another brand new board from the shop i bough it once after i noticed this happening, it is the same with the new one)

i7 3930K
4x8GB corsair vengance cl10 1600mhz (all in correct slots)

nvidia GTX 670

PSU is be quiet 700W - i tried 3 different PSUs all platinum and all above 750W and they all had coil whine, all the people i know that have this board, and i know 4 of them, did not have coil whine on PSUs which were lower than 760W


Every time i disconnect the power cable it happens, i have to reset CMOS or remove the battery to turn the PC on.



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a c 100 V Motherboard
a b Ĉ ASUS
July 18, 2013 5:33:12 AM

Okay so it happens when you disconnect the power cable - not when you unplug devices.

About the memory, have you set the XMP profile for the kit? Can you provide me with a memoy kit part number please?
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July 18, 2013 5:59:02 AM

raja@asus said:
Okay so it happens when you disconnect the power cable - not when you unplug devices.

About the memory, have you set the XMP profile for the kit? Can you provide me with a memoy kit part number please?


Corsair DDR3 2x 8GB 1600MHz CL10 Vengeance LP

producer's code - CML16GX3M2A1600C10
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a c 100 V Motherboard
a b Ĉ ASUS
July 18, 2013 6:02:07 AM

piotrek255 said:
raja@asus said:
Okay so it happens when you disconnect the power cable - not when you unplug devices.

About the memory, have you set the XMP profile for the kit? Can you provide me with a memoy kit part number please?


Corsair DDR3 2x 8GB 1600MHz CL10 Vengeance LP

producer's code - CML16GX3M2A1600C10


This is likely the issue. Have you combined two of these kits together? It can cause instability because the SPD and XMP timings are for a single kit only - not two!

You need to tune the memory settings and voltages manually to get the kit stable (you might need to set eveything looser than the speed of a signle kit as well).

What is happening is the kit is failing memory training at initial POST and triggering the watchdog timer for a failed OC.

Ideally you shoud purchase a single memory kit rated at the density you wish to run. Combining kits can create issues for plug-and-play. Seen too many of these cases. People either do it to save money (single high density kits can be more expensive) or they are unaware how memory is binned/works.

-Raja
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July 18, 2013 8:23:22 AM

I didnt mix anything. And it was happening even before any changes to BIOS

I bought 4 of this 8GB corsair RAM to have 32 GB memory. Corsair was a reccomended ram for this motherboard. I dont understand what you mean about mixing kits, could you explain? also, what bios settings can help get rid of this problem?
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a c 100 V Motherboard
a b Ĉ ASUS
July 18, 2013 8:30:27 AM

You have combined two single kits to get 4 modules. Each kit is 16GB and you have purchased two to make 32GB. That can cause stability issues. For reasons you won't understand - it's to do the loading the memory bus and the load that a kit represents plus the bin.

Lots of settings may need to be tweaked in this case - VCCSA, CAS, tRCD, tRAS plus adding some spacing to some of the second and third timings. I don't advise to tweak DRAM voltage higher than spec unless you have to. You can pull down the IO other ways without resorting to voltage sometimes. As you are finding out this might be complicated for you.

Load XMP, then add +1 to CAS, tRCD to start. If that does not help you may need to increase VCCSA aand then start adding +1~+2 to the third timings also. I dont have time to walk you through all of this, ideally you should have puchased a SINGLE 32GB memory kit, not 2 X 16GB kits.

-Raja
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July 18, 2013 8:35:54 AM

You are the first person to ever explain me this situation, and i asked at many places...., so what RAM would you reccomend for me that would work PERFECTY and will be 100% compatible

I will sell this ram and buy the one you reccomend. So i have to stay away from products that have 2x8GB in their name? only a single 16GB or a single 8GB is OK?

BUT i dont have money for a sinle piece 32 GB ram.... can u tell me what single kit 16 gb ram would work? or 8GB RAM but a single kit, so i can buy 4 kits and have 32 gb?

something ideally for about 400$

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a c 100 V Motherboard
a b Ĉ ASUS
July 18, 2013 8:40:49 AM

Check Gskill and Corsair for 32GB memory kits qualified on X79 motherboards. Try not to go for a kit rated faster than DDR3-1600, becuase the faster you go the more tuning you may have to do. Intel offocially supports DDR3-1600 at CAS 11 only. Anything faster than that can require elevated voltages and may need manual tuning.


OR you can try tuning yourself with the kits you have first. Won't hurt you to at east try I think.

Do not buy 8GB or 16GB kits to make 32GB - you may end up with same instability problem and then need to tune manually. If you cannot afford anything at 32GB then you will need to either run less memory or try and tune the board manually as suggested.

-Raja
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July 18, 2013 8:56:35 AM

Thanks, i guess i was unlucky :( 

My friend has the same setup (we and 2 other guys bough the same stuff) but i decided to go with a different ram, he bough the same 2 kits each 2x8GB but different company. On the other hand he has a problem with SSD drive, which does not se his operating system, he has to reset and then it sees it.



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a b V Motherboard
July 18, 2013 9:20:27 AM

What , I think he is saying, is you need to buy a kit all the same, so as the amount of memory gets greater the board can easily see the new timings required. Two different brands is confusing the bios as one brand may have slower timings at 32 gig than the other. Try to stick with the same brand at this volume!
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a c 100 V Motherboard
a b Ĉ ASUS
July 18, 2013 9:44:35 AM

That is one part of if Chris. Even if the two kts are identical, the timing set has been bined for a single kit - both the SPD and XMP will have a timing set selected based on the densiy of the kit. Much of this is IO and signaling based.

You can sometimes get lucky with similar kits if they have a lot of overhead in the bin at thedefault voltage and/or when the CPU memory controller happens to be a "good" one. This is all luck of the draw - best practice of course is as stated earlier.
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a b V Motherboard
July 18, 2013 10:05:51 AM

raja@asus said:
That is one part of if Chris. Even if the two kts are identical, the timing set has been bined for a single kit - both the SPD and XMP will have a timing set selected based on the densiy of the kit. Much of this is IO and signaling based.

You can sometimes get lucky with similar kits if they have a lot of overhead in the bin at thedefault voltage and/or when the CPU memory controller happens to be a "good" one. This is all luck of the draw - best practice of course is as stated earlier.


So they binned it, set it as fast as it would be reliable at 16 gig or 8 or 4 (kits) but it wont go that fast at 32? So buy a whole kit to avoid probs. . I gotcha.
Not like stuffing in 2 gig from another old box is it?
Sheesh, You guys know your onions.
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July 18, 2013 5:16:20 PM

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

Ok, i tried with 1 RAM kit, so 2 pieces of 8GB ram , when i unplug the power cord, wait for light to go out, and then plug it in and start PC, it works, the PC starts, but when i though it was ok, i plugged my router, my new mouse, 2 monitors, closed the case and started the PC, it didnt work.... i give up, i never had any problems with my other motherboard and i didnt heard anyone having such idiotic problems with theirs. I am sure it is the RAM's fault, i have to point out that i followed the info on asus site when i picked my RAM, the only thing i did differently is that i have CL10 instead of CL 11. IT is crazy that such thing can mess up the mobo which has so many fancy features like "MEM OK" button which should fix such issues, i mean really.... PC refuses to start becouse ram is not CL11 but CL10? Asus lost a lot in my eyes.
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August 5, 2013 8:44:42 AM

The problem is getting worse, bluescreen appeared as i was browsing the web and i had to restart bios to start it. I loaded my OC settings that worked, but i got bluescreen at windows load, the only OC settings that work are from the bios auto OC.

On a asusrog (asus north america you tube channel) i saw a video explaining how to assemble a PC on x79 motherboard.
He uses 2x 16GB kits, also, on sabertooth x79 reccomended vendors, there is not a single 32 GB RAM kit available, all 16 GB kits. So i think that having 2 kits of 16 GB is not an issue, the issue is with this useless motherboard. I will not be able to even sell the PC with such problems.

Can anyone help me configure RAM so it will work please?
Here are my system specs again:

asus sabertooth x79
i7 3930K
2x8GB corsair vengance cl10 1600mhz X 2 (2 kits of 2x8GB making a total of 32GB)
nvidia GTX 670
PSU is be quiet 700W

Every time i disconnect the power cable it happens, i have to reset CMOS or remove the battery to turn the PC on, also i noticed the system is not stable, i get bluescreens when i run it OC too long. right now only the auto OC from bios makes it so that the system is stable, and it was not like that all the time, bluescreen problem started few days ago overnight and i had to change OC settings.

(the problems with CMOS were even before OC)


raja@asus - "Check Gskill and Corsair for 32GB memory kits qualified on X79 motherboards. " - I checked and there is not a single 32GB kit reccomended on sabertooth x79 manual.


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a c 100 V Motherboard
a b Ĉ ASUS
August 6, 2013 10:14:25 PM

raja@asus - "Check Gskill and Corsair for 32GB memory kits qualified on X79 motherboards. " - I checked and there is not a single 32GB kit reccomended on sabertooth x79 manual.

Check with Corsair and GSkill directly. Or learn to make UEFI adjustments. As I said to you earlier, using two kits is a gamble. Add +1 to CAS and tRCD. Then maybe add 1-2 clocks to third timing sets. And then start adjusting voltages if need be.

-Raja
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August 7, 2013 2:44:23 AM

"As I said to you earlier, using two kits is a gamble. Add +1 to CAS and tRCD. Then maybe add 1-2 clocks to third timing sets. And then start adjusting voltages if need be."


I tried adding +1 to CAS and the three other values also (RAS). I could not find tRCD. But it didnt work

(THE PICTURE IS FROM THE INTERNET BUT PRIMARY SETTINGS ARE THE SAME AS MINE)




I noticed i have to have the CPU voltage set to manual for system stability, otherwise i get bluescreens. Strange thing is that it was not always like that, it happended overnight.

Maybe if i set the timings and ram voltage to AUTO it will start working? or will it just make things worse?


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a c 100 V Motherboard
a b Ĉ ASUS
August 7, 2013 2:46:14 AM

You'll have to test everything systematically. Start with Memtest, make changes and monitor for impact. Once you start passing that, then move on to OS level stability tests and repeat.
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August 10, 2013 9:52:16 AM

I borrowed my RAM to my friend, and it works ok for him. He has the same identical setup as mine, the only difference was the ram, it is crazy and i dont know what to do now, BIOS is the only option but i updated it to the new version today, still the same problem.

I noticed when i push the power button really fast ( i was really mad) for about 20 seconds, the PC will turn on..... and i dont have to reset CMOS....


PS: i am not some raging kid (im 28) ,and i've done one computer setup before, i did not do anything wrong, i though i might have installed bios in a wrong way, i even started another thread on this, but as i was updating to the new version now i think i did everything fine.
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September 9, 2013 4:13:00 PM

I GOT THE SOLUTION:

First of all i would like to say that i did not have any info on this in the instruction for mobo and case( i double checked).

The instruction for the case i bough, and motherboard, didnt say how i should mount the mobo on the case, i used the distance bolts becouse they fited the case, but what i did not do, is use the rubber/cardboard rings on both sides of the screw (side the motherboard was touching the distance bolt and where the screw touched the motherboard).

Why i didnt use them? I got the rubber rings but they were too high/thick and i was unable to mount the mobo using them ( i checked again, it cannot be mounted and i dont know why they gave them).

So, a BIG GIGANTIC FAIL TO case manufacturers that give 2 page instructions with useless information and motherboard manufacturers for making a motherboard that cost nearly 400 Euro, and makes a short when there is no rubber/cardboard on the distance bolts WHICH WAS NOT STATED IN THE INSTRUCTION I SHOULD USE.

Sorry for caps but i spent 2 month RMAing mobo, PSUs, and countless hours trying to figure out what was wrong, I built my last system without any problems, it was 5 years ago. And now, i spent 4 times more money on this high end PC, and had to pay 30 euro for diagnosis that i have to place cardboard rings on the screws. Are you kidding me?
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