X99 overclocking with 8 sticks of RAM

Phemo · 5 Oct 2015 at 17:29

Hi guys,

Currently got a system with 4x4GB sticks for 16GB and a 5820K at 4.4GHz running nicely. Looking to add another 4x4GB sticks for 32GB but just wondering if this will have any adverse effects with my overclock? I haven't done anything crazy with the RAM and it's just running at its stock of 2400MHz but if I can keep the same speeds/timings/CPU overclock with all 8 slots populated that'll be a nice plus.

Any input appreciated. Haven't found much useful info on this subject by Googling so just wondering if anyone has any first-hand experience.

Silent_Scone · 5 Oct 2015 at 17:57

32GB @ 2400Mhz shouldn't be an issue, however - mixing memory kits is not advised and there is no guarantee this will work without tuning (latency, voltage). Especially with 8 slots filled, even with ASUS T-topology

mmj_uk · 6 Oct 2015 at 18:06

It may do as 8 sticks will put extra stress on the memory controller.

ukxenon · 7 Oct 2015 at 20:40

I would like to know this as my son has my X99 rig for collage / games

ZXSpectrum · 8 Oct 2015 at 11:29

I have done it with 64Gb (8x8Gb) and will soon be testing with 128Gb (8x16Gb) Generally the only thing that requires changing is the VCCSA(IMC) voltage.

Silent_Scone · 9 Oct 2015 at 15:02

ZXSpectrum said:
I have done it with 64Gb (8x8Gb) and will soon be testing with 128Gb (8x16Gb) Generally the only thing that requires changing is the VCCSA(IMC) voltage.

At what frequency?

ZXSpectrum · 9 Oct 2015 at 15:11

Either 2666 or 3000Mhz

Silent_Scone · 9 Oct 2015 at 15:14

ZXSpectrum said:
Either 2666 or 3000Mhz

What kind of SA voltage for 3000 64GB? Not many IMC's will do that stable. I've just picked up a 32GB 4x8 kit, 3000 would be great but on 1.25 strap you lose out on the adaptive voltages. Looking for C12 2666

ZXSpectrum · 9 Oct 2015 at 16:37

I am awaiting the 3000Mhz memory to arrive. Should be here next week so will update you then. I will be testing the 16Gb modules as well.

Silent_Scone · 10 Oct 2015 at 12:55

Thanks, would be keen to hear. I've fitted a 4x8gb kit and spent a couple hours yesterday getting it working happily at 2800mhz C15 1T on 100 strap with tight secondary, didn't need any bump on VCCSA over 16gb 3200 C14, at 1.04v.

Use Google Stress App test on Linux Mint if not doing so already. Shatters a few dreams of what is stable.

5960xNvidiaGamer · 12 Oct 2015 at 20:16

Phemo said:
Hi guys,

Currently got a system with 4x4GB sticks for 16GB and a 5820K at 4.4GHz running nicely. Looking to add another 4x4GB sticks for 32GB but just wondering if this will have any adverse effects with my overclock? I haven't done anything crazy with the RAM and it's just running at its stock of 2400MHz but if I can keep the same speeds/timings/CPU overclock with all 8 slots populated that'll be a nice plus.

Any input appreciated. Haven't found much useful info on this subject by Googling so just wondering if anyone has any first-hand experience.

I asked this same question myself when building my X99 build. Ended up going with 8 sticks of 4gb and the overclock is stable at 4.7ghz from 3ghz on a 5960x, so still overclocked really well. Youll likely be fine and get good results still.