Z370 Killer/ac - XMP issues also?
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=7991
Printed Date: 06 Aug 2025 at 9:46am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z370 Killer/ac - XMP issues also?
Posted By: steveg
Subject: Z370 Killer/ac - XMP issues also?
Date Posted: 09 Mar 2018 at 11:04am
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I am curious what experiences others here have had with this board. I have an I5-8400 (yes, no overclocking) Corsair Vengeance LPX 8GB 4000MHz GTX 1060 6GB II bought this memory after buying the MB because it was listed in the MB QVL list. However, I have yet to get it to even breach 2133 (1067MHz x 2). I can set it to XMP and choose auto, 4000, 3800, 3200 and while the system boots, the MB is reverting it to 2133 (verified using cpuz, Task manager, HWInfo). DRAM voltage appears to be working and uses the XMP of 1.35 . I have also tried manually setting VCCIO at various levels from .97-1.1, VCCSA from 1.07-1.1 experimenting and either it did not boot or it came up at 2133 anyway. Also have tried bios 1, 1.1, 1.2, (have not done 1.5 yet as I am waiting until I am finished, since that seems to have only updated for M/Spectre thing. Anyone else have any experience with this board> From reading here it sounds like ASRock is having trouble with memory voltage bios settings and I am wondering if the same issues are happening with other boards. |
Replies:
Posted By: steveg
Date Posted: 20 Mar 2018 at 2:09pm
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" rel="nofollow - nobody else experience similar (or have better results) with this board? I have tried some more but it always just seems to reset back to 2133 no matter what I set. BIOS 1.5 (latest) does not help.
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Posted By: wardog
Date Posted: 20 Mar 2018 at 2:21pm
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" rel="nofollow - What is the Kit part number of the mem? |
Posted By: steveg
Date Posted: 21 Mar 2018 at 2:11pm
CMK8GX4M2B4000C19RThe end R is for red. It is on the QVR kist which is why I bought it.
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Posted By: abitcloudy
Date Posted: 24 Mar 2018 at 8:58am
My RAM is CMK16GX4M2B3000C15 and freezes constantly with win10 and i5 8600K across all BIOS versions. Difference is I have Z370 extreme4 MB. There's no rhyme or reason as to when it may lock from what I can tell. I've tried the voltage adjustments mentioned in other threads as well, disabling intel virtualization extensions/secure boot etc, no joy.
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steveg wrote:Posted By: wardog
Date Posted: 24 Mar 2018 at 9:32am
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Steve, I apologize for not getting back to you sooner. Your mem. Go to http://www.softnology.biz/files.html and install the Freeware ver of Thaiphoon Burner. Once installed start it and select "Read' there in the middle top. Select a bank that has a stick in it. Full screen it so that all data is shown in the app. Then at the bottom click on Screenshot, upload that to an image hoster and paste the link here please. . Too, try setting them up with/by/using their XMP Profile, BUT, change the mem speed to 2666, Save and Reboot. Any change or still revert to 2133? |
Posted By: wardog
Date Posted: 24 Mar 2018 at 9:35am
abc, post a pic of/with the stickers of both sticks of your mem Kit please. Readable. |
Posted By: wardog
Date Posted: 24 Mar 2018 at 9:39am
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" rel="nofollow - Also. Both of you. You DO have the sticks in slots A2 and B2, right? If not, change them, clear the BIOS and post back. Clear the BIOS after, this is important. Whenever you move mem in and out or swap ALWAYS clear the BIOS. Even if moving the same sticks in and out. |
Posted By: steveg
Date Posted: 24 Mar 2018 at 3:43pm
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Thanks for your help. Mem is in slot 2 & 4 (A2 and B2)
Interestingly following your advice I was able to hit 2666. Then I tried 2800 and it worked as well. Anything above 2800 fails or reverts to 2133. Voltages were on auto. I am wondering if the issue is with the voltages. At 2800 it looks like they may be maxed out. They are: VCCIO 1.144 VCCSA 1.216 VCCST 1.152 I tried to bump them up manually just a touch (to attempt 2933 or 3200 that way) but I would increasing would hit red and revert to near these. The MB did not seem to want me to go any higher. I tried manually setting VCCIO 1.140 VCCSA 1.200 (highest manual it would do) VCCST 1.150 (highest manual it would do) But 2933 or higher would not boot. Thaiphoon screenshot:  |
Posted By: wardog
Date Posted: 24 Mar 2018 at 4:52pm
Thanks for the confirmation at 2666. Hmmmm.......... where to begin here with you................ For starters, I'm an AND FanBoy  , so Intel is at times foreign to me. I google too much when here on the Intel side of the forum. That's good, and at the same time, not so.This time it appears it's good. A few hours practicing my Google Fu here on this turned up a nugget. Intel i5-8400 CPU Review: 2666MHz & 3200MHz Gaming Benchmarks: https://www.gamersnexus.net/hwreviews/3086-intel-i5-8400-cpu-review-2666mhz-vs-3200mhz-gaming And yes. Those v's are steep for the gain. No sense shortening this processors life-span running it at those v's 24/7 daily. Back to mem, which I know like I was born with 4 sticks in my mouth. The link above. Not much diff at all between 2666 and 3200 on a locked 8400. Some, yet not a whole lot. Here's what I'd do here knowing that. Grab AIDA64 and find the sweet spot between voltages and timings. Seeing how low you can get the timings at 2666. That 4000 kit you have uses Samsung e-die IC's which will offer up quite the plethora of options timing wise at 2666. Don't get your head wrapped around a low CAS/CL either. High speed mem behaves very differently when lowering the Mhz than say 2800 mem being OC'd to 3200/3600. My Sig. That 4133 is Samsung b-die IC's. I can make it pump out comparable latencies using different CL's and if you were to look at the only the resultant generated numbers you wouldn't know that they were using different CL's. But I wouldn't be comfortable running a VCCIO at that stated 24/7. By the slight gains @ 3200 plotted in graphs of the article above? Nope. No way. Keep me posted on your progress. EDIT: that > than |
Posted By: badbri
Date Posted: 25 Mar 2018 at 4:16am
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Thanks Wardog, you validated my reasoning for getting good 2666 ram over 3200 for my 8700 which I use primarily for video editing/re-encoding and need stablity more than a few percent of boost. https://i.imgur.com/ZgdsA1x.jpg" rel="nofollow - https://i.imgur.com/ZgdsA1x.jpg ------------- https://www.passmark.com/baselines/V9/display.php?id=99573335296 |
Posted By: wardog
Date Posted: 25 Mar 2018 at 5:53am
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" rel="nofollow - IMO, a "production' box should NEVER be OC'd. You are correct in that thinking. That said, your G.Skill F4-2666C15D-16GVR sticks @ 15-15-15-35 prolly can't be beat for the price. G.Skill does offer some same and lower timings mem at higher freq's for your Z370 Pro4/8700K that don't req OC'ing. http://www.gskill.com/en/configurator?manu=52&chip=3094&model=3121 . |
Posted By: steveg
Date Posted: 25 Mar 2018 at 9:35am
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" rel="nofollow - The first set of voltages (@2800) were set automatically. I did not manually set them. So even though the MB selected those they are high enough to potentially lower the life of my cpu you think? |
Posted By: badbri
Date Posted: 25 Mar 2018 at 10:45am
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" rel="nofollow - I am not not memory master like wardog but do know raising voltages can have ripple effect on other parts and in this case it be the ram and memory controller in cpu. If you could get the voltages at 2666 and lock them in and then adjust mem timing you still may be able to hit 3000 or 3200. You will have to experiment with the cas/ras timings, try something like 20-24-24-50 @3000 just to see if it worksNot exactly the same but worth a read: http://forum.asrock.com/forum_posts.asp?TID=7668 update: just checked my voltages and two are running a bit lower than yours but not by much, my VCCSA is about same as yours at 1.210v. Wondering if Intel raised the volts (compared to 7000 series) due to the 6 cores for added stability.... ------------- https://www.passmark.com/baselines/V9/display.php?id=99573335296 |
Posted By: steveg
Date Posted: 30 Mar 2018 at 1:22am
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Thanks everyone. I have left the memory at 2800 rather than try to push it to the advertised speed. It looks to me like ASROCK QVL testing is not really at advertised speed but likely they just check if the memory works. I am finding 8GB is really not enough memory and just purchased another 2x8GB. This time I went with G.Skill and used their recommended RAM configuration. I bought one that runs at 3000 and CAS 15. I am not sure how that all will pan out with the existing RAM. But I definitely don't want to buy another round of Corsair high speed memory at a premium price when it can't run that speed. I will have to see what the motherboard attempts to run both of the pairs at and go from there. Possibly removing the Corsair if necessary.
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Posted By: steveg
Date Posted: 30 Mar 2018 at 1:58am
| Just noticed there is a new bios that is supposed to improve memory compatability. Unfortunately it seemed to have no effect for solving the issue with my corsair memory. |
Posted By: steveg
Date Posted: 04 Apr 2018 at 10:22am
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OK. So I needed more memory and purchased this time G.Skill F4-3000C15D-16GTZ, which is QVR for this board by both G. Skill and ASRock. Placing the two pairs (Corsair in A1/B1 and Gskill in A2B2 the computer would not even boot up. I removed the Corsair and place GSkill in A2/B2 and it booted by default to 2133. Then I tried various setting and exactly the same. No more than 2800! This new memory is DDR4-3000 so I was hoping just to get that out of it. I noticed whenever I tried set up xmp and 3000 it would increase the blck to 102hz (!) but it still would not work when I manually overrode blck back to 100. Something is not right with the memory setup in the bios. It seems buggy.....
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