Some RAM sticks randomly fail to load

classicus

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Nov 17, 2013
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10,510
I purchased a CyberPowerPC several months ago and have noticed this issue for most of that time.

I have the ASUS P9X79 notherboard, 8 ram slots each with a 2gb Cosair Dominator I believe, totaling for 16gb ram.

Usually, within the first hour or two of my PC running, it'll BSOD and come back up only reading 14gb ram. At this point, it

can remain stable for days or weeks. On rarer occasions, it will BSOD again and come up reading 12gb ram. It has

never got BSOD when reading 12gb ram. Then on super rare occasions, it can run for days reading all 16gb ram.

I usually always just sleep my PC overnight, and stick with 12/14gb ram its reading most of the time. If I shut it down

overnight, usually the next morning it comes up with 16gb ram, and the process repeats. If I shut down and turn on

a few minutes later however, it will only read what it previously was reading (12gb or 14gb)- Except when I shut down, open

the case, and give each ram stick a good push. Powering on after that, it'll read all 16gb, and repeat the BSOD

process.

I have tried switching the slots each stick is in, and still experience the same issue. I have tried running a couple

memtests when all 16gb were being read, and sometimes, the computer will completely freeze before 1 cycle completes.

Other times, multiple cycles will complete over the course of a whole day with no errors reported.

I'm at a loss on what is going on here. Each ram stick is seated tightly and fully clicked in. I've made sure they

were sitting in tightly, but like I mentioned above, I find it strange if I do a shut down, quickly give the ram a

push [which is already sitting tightly and feels like my push is doing nothing], power on, and all 16gb are read. Memtest will report no issues if it doesnt freeze before the 1st cycle is complete.

Anyone have any ideas on where the issue might exist?
 

Wamphryi

Distinguished
Not all RAM behaves well in all boards. Quad Channel set ups are tricky and require RAM that the system feels happy with.

I would swap out for 4 x 4 GB and see how that goes. Those boards are really set up for larger DIMMS.
 

classicus

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Nov 17, 2013
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10,510
@Trademan1: Looking at the voltage in BIOS. Just want to confirm I'll be changing the right ones. Currently all voltage settings are Auto. I see the following in regards to DRAM and VTT:
DRAM Voltage (CHA, CHB) "1.517v-1.526v" [slight fluctuations due to Auto]
DRAM Voltage (CHC, CHD) "1.517v-1.526v" [slight fluctuations due to Auto]
VTTCPU Voltage "1.056v-1.066v" [slight fluctuations due to Auto]

Should I try changing all 3 of those to a locked value around the increases you mentioned?

@Wamphryi: That's a last-resort solution I will do if I can't resolve this.
 

classicus

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Nov 17, 2013
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So far so good. If my PC does not BSOD once throughout the next 1-2 days, then looks like I finally found the solution. Will update then, and thanks again for the suggestion. So far it is promising. I'm hoping this resolves the issue.
 

classicus

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Nov 17, 2013
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It was running good for several hours. Then as soon as the display turned off from inactivity, it had a BSOD. It came back up seeing all 16gb which usually does not happen. About 5 minutes in, it shut down immediately, then came back up again, still showing all 16gb.
 

classicus

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Nov 17, 2013
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After changing the DRAM to 1.575, my PC started rebooting every 5-10 minutes. It was bad. I upped the DRAM again to 1.595 and it's been running smooth for many hours now. However, once I walk away for several minutes, it'll reboot. It doesn't like being inactive for too long.
 

classicus

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Nov 17, 2013
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No, I don't have the latest bios. I never updated bios before, but I tried to update it to see if it would resolve the issue. I got the latest bios update for my motherboard from the ASUS website, but when I tried to flash it, it gave me an error message "Selected file is not a EFI BIOS!" Actually I'm doing some research now and this looks like it might be a particular issue using the ASUS EZ Flash utlitiy in BIOS. I have the update on my USB, and someone mentioned that the USB has to be in FAT32 format and not NTFS for it to work. I will give that a try and see what happens
 

classicus

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Nov 17, 2013
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Yep, the drive had to be in FAT32 for the .cap file to flash. The new BIOS GUI is nice and fancy compared to my old one :)

Came up reading all 16gb, lets see where this goes.
 

classicus

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Nov 17, 2013
21
0
10,510
Just got the reboot now...and I was getting hopeful. However, the DRAM and VTT voltage were set to Auto after BIOS update. I can try upping those and seeing if it helps with the new BIOS version.