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Problems with DDR4/3000 XMP Overclock

Level 7

I'm experience crashing/rebooting/occasional BSODs when I run my memory in it's XMP profile with no other overclocks.
With XMP enabled, the system can run MemTest for 24 hours with no errors, but crashes often in Windows, sometimes immediately after boot or with relatively no load.
Revert the RAM back to stock speed and it works flawlessly for weeks on end.

Corsair 32GB kit (2x 16GB) DDR4/3000MHz 15-17-17-35 1.35v (see attachments for additional timings)

Motherboard is running is pretty much default aside from a few modified boot & CSM options that are necessary for NVMe boot.
One thing I have noticed is that even as the XMP calls for DRAM voltage to be 1.35v, it is consistently at 1.344v.

I have a strong suspicion that I just need to flip a few settings but not sure where to start. Any feedback is appreciated!

Other system specs:
-Intel Core i7 #6700K @ stock 4.0GHz/4.2GHz (Turbo)
-Corsair H115i Closed-loop CPU Cooler
-Asus Maximus VIII Hero Z170 Motherboard, latest BIOS (v1504, same issue with v1402)
-Samsung 950PRO M.2 NVMe, 512GB
-Nvidia GeForce GTX 760, 2GB GDDR5, PCI-E 3.0 x16
-Windows 10 Pro. x64

Hi Chino,

I used Memtest86 Pro v6.3, ran off a USB stick from UEFI boot. Four cycles of every test, about 20 hours.

Level 12
Try upping the DRAM voltage to 1.37v and would suggest that you update to bios 1601.
Do not use the XMP profile, use all manual bios settings for now.

Have you played with the VCCIO and SA Agent voltages?
Intel i9 10850K@ 5.3GHz
ASUS ROG Strix Z490-E
Corsair H115i Pro XT
G.Skill TridentZ@ 3600MHz CL14 2x16GB
EVGA RTX 3090 Ti FWT3 Ultra
OS: WD Black SN850 1TB NVMe M.2
Storage: WD Blue SN550 2TB NVMe M.2
EVGA SuperNova 1200 P2
ASUS ROG Strix Helios GX601

+1 on carefully tweaking up the VCCIO and SA voltages. That seems to be mandatory for high speeds on DDR4. 1.25 for VCCIO and SA were what stabilized my system -- Maximus VIII Hero, I7 6700K 4.7GHz, G.Skill DDR4-3000 16GB dual-channel.

Try setting the "Maximus Tweak" option to "Mode 1". This relaxes the set timings slightly. At 3000MHz, even slight timing variances can have a huge effect and this seems to allow for some tolerance.

BIOS 1601 also seems to help. Can't put my finger on it, but overall stability and performance is just better.
Motherboard: Maximus VIII Hero
Processor: I7 6700K - 4.9GHz OC
CPU Cooler: Corsair H80i v2
Memory: G.Skill DDR4-3000 16GB
Graphics: EVGA GTX 1080 FTW2 1721/1860MHz
Storage #1: 1TB Western Digital Black
Storage #2: 2TB Western Digital Black
Case: Antec Nine Hundred
Power Supply: Antec Edge 650 80+ Gold
OS: Windows 10 Pro

Hello all,

First off, thank you for all your help so far on this.

An update. Updated my BIOS to 1601, no change. Then I boosted the VCCSA and VCCIO voltages from around 1.15v to 1.20v, with my DRAM running at 1.344v (supposed to be 1.35v, forcing to 1.355v still makes it run at 1.344v) and enabled Maximus Tweak Mode 1. With these changes, I continued to experience issues with the system locking up.

I RMA'd the RAM... got a new kit of the same stuff. Same results. At Eric's recommendation, I boosted the VCCSA and VCCIO yet again up to 1.25v. Running some tests tonight so I'll report back on the status of it. If you have anything to add, I'd love to hear it. Thanks so much!