Help with 128GB Overclocking - looking for 3000MHz+

[acer0169]

Long story short, I have my new machine up and running with a 1950X, 128GB G.SKILL kit, on a Zenith Extreme MB. I've slowly tried to get the memory somewhere close to it's rating speed (3600MHz) but I know running at full-beans is asking a bloody lot from 128GB.

I've got my eyes on at least 3000, but I'd like 3200MHz if possible, unless the timings get too silly and not worth the frequency increase.

Over the last two days I've gone from 2133MHz to 2733MHz on effectively stock settings, all stable. I can run MemTest86+, MemTest Pro (windows), and Prime95 for hours without issues (hence taking so long to move the speeds up).

To get to 2733MHz, most things were left at stock apart from giving the memory 1.25v, the RAM SoC up to 1.1v, and a little boost on the CPU voltage. I've also increased the boot RAM voltage, and the VTTDDR to correctly match half of the memory's voltage settings. I've allowed CPU, RAM, and SoC to draw up to 110% current just in case the OC requires it. None of that was *needed* for the 2733MHz, but as I'm looking at getting over that, I knew them settings were going to come into play eventually and thought to avoid errors at this stage, it wouldn't hurt setting a few things up as I believe they should be for now, or later speeds.

If I try to run 2933MHz however, the system is stable to use (browsing, games, whatever - for hours and hours), but testing the RAM shows it's clearly not 24/7 perfect. I get errors within Prime, and MemTest Pro either BSOD or gives errors instantly.

To try to help this, I've increased memory to 1.365v, SoC to 1.15v, boot RAM voltage to 1.37v, and tried loosening the timings from automatic 17-16-16-39 to 18-17-17-40 but still get errors. POST and such is fine, I just want it flawless. I use RAM caching, as well as memory-intensive tasks, so it's important it's stable.

I was hoping some RAM gurus here could maybe throw a few tips and tricks at me to try to see if I can at least get 2933MHz stable, and then I can do similar again to see if I can push further.

I know there won't be loads of people running 128GB to just give me settings to copy, but things like SoC is not something I've had to play with before in the past, but I understand with the amount of memory I'm running there's all sorts of settings that come into play which are just too much for me to read and fully understand to tweak at will.

 

[HazardO]

Typically the more RAM in a system (specifically the more sticks), the harder it is to get high memory clocks. I'm no expert on the AMD CPUs, but I suspect you've hit the limit of what your CPU's uncore can cope with. Also if you slacken off timings too much you'll end up with RAM that has higher access latency than if you had lower clocks with tighter timings. Another thing to bear in mind is that a quad channel memory controller with 2666 GHz RAM has a lot more bandwidth than a dual channel controller running with 3600.

 

[8 Pack]

One on ten of those cpu can do 3200mhz with 128gb of ram. If you need that ram capacity run low latency at 2666mhz. If you want 3200 run 32gb 4x 8gb where 9 in 10 can do.

 

[acer0169]

With the G.SKILL in particular, quite a few have seemingly got 128GB at least 2933MHz with good timings. I'm still working on it at the moment with a few voltages and settings. I will rarely use the full capacity, but will occasionally, hence wanting a good balance between frequency and latency. Just to humour the idea of pushing the memory as quick as I can, any settings I should be looking at or keeping my eye on?

 

[8 Pack]

Proc odt, 2t command rate, soc voltage, tref timings ..... Those stocks should go c16 easy 2933 mhz its not the memory its the cpu.

 

[acer0169]

Thank you mate.

 

[acer0169]

Update to anyone that may find this. The best I got to was 2866MHz (or a touch over with a 101 / 102 bus clock) and timings 13-13-13-24-42. Anything more than that, and I need almost a full 0.1v extra through the RAM, more and more on the SoC, and I still have the odd issue within Windows (error messages about memory) even if Prime95 and such run stable for hours. It'd be lovely to eventually run this memory right up at a 3200+ or so with tight timings, but for now, this is screaming with a good speed, good timings, and a 4GHz OC on the 1950X.