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X99 random ram slot drop

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Often I turn my PC on and notice there is only 12gig of ram showing in windows. All 4 sticks are being seen by AIDA64 and CPUZ. I check BIOS to see which stick is missing and it is usually C. Sometimes taking it out and putting it back in again works but not always, and sometimes the problems just goes away on it's own. Other times I take out all the sticks and put them back in the SAME slots reboot and find C is working but A has dropped out! Or A and D! Is my motherboard likely the problem?

Asus Rampage Extreme 5
5930K
16gig(4x4) Kinston HyperX Predator

XMP 3000mhz 125 strap
 

cadaveca

My name is Dave
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Try cleaning the DIMM contacts with an eraser. It might be the motherboard, the CPU socket, or the DIMM itself. I find this happens more often with ASUS boards than any other, for some odd reason. It might simply have to do with how the memory training is done on boot, so if you don't have the most recent BIOS, or this started after a BIOS update, flash BIOS.
 
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Thanks Dave. Had cleaned but not with eraser. I found a thread on Toms hardware from earlier this year, must have been 15 people with the same problem, looked like most of them had Asus x99 boards, no answers in this thread though. But I have just rebooted and turned on Dram SVID and all my memory is back! I will watch this every day for a while to see if the problem comes back and report back here. If this fixes the problem then this thread mite help some one else.
 
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I wonder if this was causing my crashes in BF4 over the last few months.
 
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are you overclocking cpu or ram or just running xmp with 125 strap.
newer bios has the option to oc ram higher whithout going the 125 bclk route
 
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Same here with Rampage V Edition 10, Trident Z's and a 5930K cpu. After updating BIOS and redoing a less extreme RAM overclock it is fine (3200mhz, 1.36v and relaxed timings). I never used anything higher than 100 hz strap/BLCK.
 
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@basco Overclocked CPU. 125 strap, no OC on ram just xmp. 1902 BIOS, I have not updated to the Broadwell BIOS but I will now that you say they have fixed the picky ram timings issue.
 
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99% it is your RAM chips. I had similar problems with my first set of DDR4 RAM from ADATA. I was running 125BCLK to get DDR4-2800. It started out fine. However half a year since installation I started randomly loosing one stick. It was always 24GB recognized out of 32GB. I tried different BIOS version as well fine tuning RAM voltage. In the end the only way I fixed it was by reducing RAM speed to DDR4-2666. I thought I had a week IMC for the 5820K. However the same 5820K IMC happily accepted 128GB of GSKILL DDR4-3000 RAM at CL14! So my conclusion was the Hynix based DDR4 RAM was not good quality, which led to all the random DRAM slot dropping problem.

My suggestion to you will be RMA your RMA sticks. Or return them and get some quality DDR4 RAM that utilize Samsung chips instead of Hynix chips.
 
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first i would try to oc on 100mhz bclk clock without xmp and see if that helps.
is the same happening whithout overclock?

you could try latest bios without broadwell support which should be 2101:
http://dlcdnet.asus.com/pub/ASUS/mb/LGA2011/Rampage_V_Extreme/RAMPAGE-V-EXTREME-ASUS-2101.zip

From Sin0822's ultimate sandy-e overclock guide:
"What is SVID and how does it affect Overclocking?
SVID is a 3-wire digital communication protocol between the CPU and the PWM, it allows for the CPU to change its VID on the fly to fit the frequency selected. That is why you can increase the base frequency +/- 6-7 multipliers and the CPU remains stable, because SVID is increasing the VID without you knowing. Now this doesn’t stop unless you manually set the voltage, so when users use DVID offset, they should be aware that their stock VID really isn’t constant. That is why I do not recommend DVID with SB or SBe, at least not above 1.4v. SVID potentially can increase voltage to 1.52v on its own, but that has never really been seen. SB and SBe both have this 1.52v max for SVID."
 
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I've had this problem once i didn't even notice it for some time, i ended up changing my sticks around and haven't had the problem show up again, I also moved the the latest bios 3202, all my OC settings are still stable and the Asus Boot logo looks cleaner lol, and I've always used 100 strap as well.
 
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@Live OR Die it ended up being the Svid. I had changed sticks around lots of times with no joy. I have just loaded the 3202 BIOS, I was always using the 1.25 strap but now I can use the 100 strap for 3000mhz. And my Asus boot logo looks cleaner!
 
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Try pressing the MemOK ! button,maybe that will help...same happened in a ASUS X79, hittingMemOK button and things turned good
 
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