64GB at 2400 is all I want, but it's fighting me.

[Minacious]

Motherboard: Rampage V Extreme

BIOS: 1701

CPU: 5960X

Memory: 64GB CMK64GX4M8A2400C14 DDR4

GPU: EVGA 980ti

SSD: 500GB Samsung 850

PSU: EVGA 1300 G2

USB Devices: Logitech G510S & Logitech G602

CPU Cooler: Temporary Corsair H75 for testing

PC CASE: Currently not in a case.

Operating system: Win10 (Yes)

Drivers Installed: Latest Asus MB Drivers

Any third Party temp/voltage software installed: No

System Overclocked (provide details) CPU at stock. RAM tested without OC, with XMP, and manually input rated RAM timings.

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I am on a journey to get this RAM to run at its rated speed (2400) with all 64GB installed and failing miserably. With everything at Optimized Defaults, the RAM, with all 64 installed, will pass SuperPi 32M, run through Memtest86 error free, 400% HCI Memtest, and consistently boot into the OS.

With XMP enabled, or a manual input of the speed and timings, it will still pass SuperPi 32M, but booting into the OS becomes sporadic (code 79 and 60 spring to mind, can’t remember the others), Memtest86 throws out errors aplenty, and HCI Memtest BSODs after some time, never getting close to 400%.

I understand that populating all 8 DIMMs requires more power and have attempted to up the DIMM voltage to 1.35 from 1.20, as well as upping the SAV, though, I didn’t go that high with it (0.90), as I felt at just 2400, it shouldn’t require that much power, but this isn’t at all my area of expertise.

I’ve read thread after thread, but don’t seem to be gaining any ground.

This is my first attempt to exceed 32GB, and well, I need some help. I just want it to run at its rated speed, nothing more.

[Arne_Saknussemm]

Hi Minacious 🙂

Probably best not to limit yourself arbitrarily with voltage. Try SAV up to 1.15...slowly increasing

0.9 might not be enough for the IMC to handle 64GB

Have you tried increasing current capability to 120 or 130% for RAM in DIGI+ section....setting phases to optimized or extreme?

If you are setting vdimm manually disable svid for RAM

[Chino]

Tweak your SA voltage using small increments of 0.01V until you've found the sweet spot for your CPU to run all 64GB. Also I would stick to HCI Memtest or Google Stress App for Linux. Memtest86 isn't as effective for DDR4 and you will just be wasting your time.

[Minacious]

Appreciate the replies.

Arne Saknussemm wrote:
Hi Minacious 🙂

Probably best not to limit yourself arbitrarily with voltage. Try SAV up to 1.15...slowly increasing

0.9 might not be enough for the IMC to handle 64GB

Have you tried increasing current capability to 120 or 130% for RAM in DIGI+ section....setting phases to optimized or extreme?

If you are setting vdimm manually disable svid for RAM

I've had it at both 130%/Optimized and 140% /Extreme for a few of the tests that failed. I will play with the the SAV and report my findings after some testing,

Chino wrote:
Tweak your SA voltage using small increments of 0.01V until you've found the sweet spot for your CPU to run all 64GB. Also I would stick to HCI Memtest or Google Stress App for Linux. Memtest86 isn't as effective for DDR4 and you will just be wasting your time.

I will play with it and see where I end up. It would seem by limiting the SA voltage to 0.90, I effectively created my own wall. I assumed 2400 couldn't possibly need more, and the problem stemmed from elsewhere, which was obviously the wrong way to go about it. I'll eliminate Memtest86 from my testing pipeline; it was the norm to use it after so many years, so it became routine.

Thank you to the both of you, and I will test and report my findings.

[skypine27]

Im running 32 GB (8 x 4GB dimms) of 3000 ram (see sig).

I cant get it to run consistently at anything higher than 2400 no matter what I do. And, to get a stable 2400, I simply set the Vdimm to 1.35v for both banks (which is the rams voltage per the specs anyway), manually set ram timing to 2400 (its just a simple drop down box on the first page of the BIOS) and dont touch any other option, and it works fine.

Skip that XMP stuff and manually set 1.35v and 2400 in the drop down box

[Powerfull]

Hi Minacious,

I am running also 64GB using two (4x8GB) 32GB kits (I know it is not recommended) rated at 2133MHz@CAS15 which I run at 2400MHz@CAS12.

Use all the advices that were given above and then you can check my post here for information:
https://rog.asus.com/forum/showthread.php?76729-Running-and-Overclocking-8x-DDR4-Modules&p=537717&vi...

[Minacious]

I appreciate the replies from everyone.

It seems my issue was either a corrupt BIOS or OS install. During testing I was getting errors and q-codes like it was the popular thing to do. Once I started to get errors that made no sense for my situation, I knew something had to be up. Out of frustration, I did both a clean install of windows, as well as a re-install of the BIOS (1701).

Now I won't know which was the actual culprit, but once that was done, my problems went away. With nothing changed in the BIOS, I simply threw on XMP for the RAM, again, I didn't touch voltages or anything, tested it for a few hours in GSA, and it passed with no errors or issues. I tested again and again to make sure it wasn't a fluke, and it passed. This is with all 64GB installed. I was ready to up the SA to compensate for having all of the DIMMs populated, but it seems I won't have to.

So, job jobbed I suppose. Well, at least on that front. As I said, I have no desire to push the RAM any further. I bought a 2400 kit to run at that speed. I do plan to OC the CPU to hopefully 4.5 (if the chip lets me get that high), but having moved back to California from England, I have been very busy, plus I'm still planning out a new hard-lined build, since FedEx saw fit to destroy my Caselabs case during its trip across the pond.

So again, I thank you all for replying.

Now, If we can all take a moment to remember the fallen.
RIP, little M8. You'll be missed.
(The M8 durring its better days.)

[Korth]

I think the sad truth is that not all i7-5960X parts can sustain 8 DIMMs at that speed, no matter how many fine voltages the mobo lets you tweak.

Populating all 8 memory slots logically fills all 4 memory channels with dual-ranked or quad-ranked DIMMs, signal latencies increase across the RAM density and precision voltage controls (which the R5E provides well but documents quite poorly) become very critical at extreme frequencies. The i7-5960X is only rated to run 4 channels of DDR4-2133 at stock and overclocked iMC capacities vary wildly from part to part.

I was never able to get my i7-5960X stable with extreme DDR4, it was just a lemon. My E5-1680-3 proc is actually a higher-binned i7-5960X die with a ridiculously robust Xeon-grade iMC (meant to control a whole lot more DDR4 than the R5E could ever address, lol), it even overclocks my combined memory kits without a peep. I suspect you're stuck with a processor-imposed cap on memory speed ... get a Xeon!

[Hardliner]

I am glad you got it "jobbed," Minacious. I am watching scenarios like yours with extreme interest for I am in the middle of a like-build. I do not want to overclock either, and I am hoping that I do not have to for at least a couple of years, until games start needing more PC power than my current stock one will be generating.

I have a Corsair 900D, but if I did not have it, I would opt for a CaseLabs. Doing a CaseLabs case as a first build is a tall order though, since it can be completely customized from the factory. Not knowing what you want/need can be a burden when buying things, so I opted for the 900D since most of the structural decisions were decided for me. My next build will be with a CaseLabs though, for I now know what I want/need.

Much luck on keeping your system stable.

[Minacious]

Hardliner wrote:
I am glad you got it "jobbed," Minacious. I am watching scenarios like yours with extreme interest for I am in the middle of a like-build. I do not want to overclock either, and I am hoping that I do not have to for at least a couple of years, until games start needing more PC power than my current stock one will be generating.

I have a Corsair 900D, but if I did not have it, I would opt for a CaseLabs. Doing a CaseLabs case as a first build is a tall order though, since it can be completely customized from the factory. Not knowing what you want/need can be a burden when buying things, so I opted for the 900D since most of the structural decisions were decided for me. My next build will be with a CaseLabs though, for I now know what I want/need.

Much luck on keeping your system stable.

Appreciate it.

Yeah, I was one of Caselabs first customers (back in 2011) and have been a loyal user ever since. It will be hard for me to go elsewhere as their modularity just isn't being matched by anyone esle, at least not in my option. They definitely cost a premium, but I haven't regretted it one bit.