X99 Taichi only seeing 32gb of 64gb quad ch ram
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=4065
Printed Date: 22 Jul 2025 at 9:20am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X99 Taichi only seeing 32gb of 64gb quad ch ram
Posted By: blark
Subject: X99 Taichi only seeing 32gb of 64gb quad ch ram
Date Posted: 20 Dec 2016 at 1:55pm
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Hello, I have an 99 Taichi on the latest bios (1.40) and I am having problems getting it to see all of my memory. My memory is on the QVL, it is: Kingston Technology HyperX FURY Black 64 GB Kit CL15 DIMM DDR4 2400 MT/s Internal Memory (HX424C15FBK4/64). My cpu is an Intel Xeon E5 2695 V3. Notes: - The motherboard's "System Browser" shows that all four channels are populated - The main screen of the bios only shows A1 and B1 (dual channel memory mode) - When I run memtest it sees all four modules but only registers 32gb of system ram - Memtest shows no errors with the 32GB ram that is enabled Troubleshooting that I have performed: - Switching memory modules (swapped a1+b1 with c1+d1) still shows 32GB on boot - Then I mixed memory modules and it still shows 32GB - Changing timing and voltages slightly does not help Please help, this issue is driving me mad! Thanks in advance. |
Replies:
Posted By: blark
Date Posted: 20 Dec 2016 at 2:22pm
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I should also mention that I have reseated all the ram modules several times and checked inside each slot with a flashlight. Likewise, I have double checked that all the CPU pins are fine and reseated the CPU.
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Posted By: wardog
Date Posted: 20 Dec 2016 at 6:10pm
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Your word "mixed' there stood out to me. Is this a 64GB(4x16GB) Matched Kit? Or instead two 32GB(2x16GB) non-Matched Kits? By what you describe it is either one of two things. The memory, or CPU and or a CPU socket with bad pin(s) Is it always A1 and B1 that are shown? |
blark wrote:Posted By: blark
Date Posted: 20 Dec 2016 at 10:23pm
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" rel="nofollow - This is a quad channel 4 x 16 gb kit. As I said, I bought it from the QVL to avoid these issues. It is always A1 and B1 that are shown, no matter how I shuffle or mix up the memory. How can it be the memory if when I switch around the modules they seem to work fine? I double checked the CPU socket last night and there don't appear to be any bad pins, I also checked the CPU socket at the store with the employee and he didn't see any either. |
Posted By: blark
Date Posted: 20 Dec 2016 at 10:35pm
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I took some photos for reference purposes: http://imgur.com/gallery/ns992" rel="nofollow - http://imgur.com/gallery/ns992
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Posted By: wardog
Date Posted: 21 Dec 2016 at 1:45am
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" rel="nofollow - The serial numbers across all four sticks, are they numbered consecutively? |
Posted By: xoanon
Date Posted: 21 Dec 2016 at 7:40pm
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" rel="nofollow - Your CPU does not support DDR4 2400 ... Try a different CPU? Perhaps a "E5-1620V4" ... ? And tell me if it works *fg* |
Posted By: blark
Date Posted: 21 Dec 2016 at 10:05pm
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But CPU is fine with underclocking the ram to 2133 for the first 32gb it doesn't seem to make sense that it would only work for half of it and not the other half. It seems waaaaaay more likely that something is wrong with the CPU memory controller or motherboard...
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Posted By: Xaltar
Date Posted: 21 Dec 2016 at 10:41pm
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" rel="nofollow - Using a single stick can you post with the RAM in each individual slot? ------------- 
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Posted By: parsec
Date Posted: 21 Dec 2016 at 11:02pm
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I hope your Xeon processor is not locked into the 2133 maximum speed of its spec. But you've tried using it at 2133, correct? With all 64GB in the board, clear the UEFI/BIOS with the jumper or CLR CMOS button on the board's IO panel. Please do not skip clearing the UEFI/BIOS. I assume you tried using the XMP profile, but don't do that for this test. Have all the memory timings and speed options set to Auto. All the way at the bottom of the DRAM Configuration screen, find the MRC Fast Boot option, set it to Disabled. Also set the Memory Test option to Enabled. That will allow memory training to occur during POST, but will increase the POST time. In the FIVR Configuration screen, find the System Agent Voltage Offset option. System Agent voltage is not necessarily better increased, but in your case give it a positive offset of 0.05V - 0.1V. In the Voltage Configuration screen, increase the DRAM Voltage to 1.25V. In my experience with X99, the missing memory in Windows, but not in System Browser, CPU-Z, etc, is normally caused by a memory OC or the memory timings being to aggressive. ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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Posted By: blark
Date Posted: 21 Dec 2016 at 11:34pm
| Thank you for this list of great advice, I will give it all a shot and report back soon! |
Posted By: blark
Date Posted: 22 Dec 2016 at 1:55am
| No luck with the recommendations thus far. I feel like I've tried every possible motherboard setting... wish I had an extra 2011-3 CPU here to try, I strongly suspect the Xeon is the culprit. |
Posted By: wardog
Date Posted: 22 Dec 2016 at 2:46am
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Posted By: blark
Date Posted: 22 Dec 2016 at 3:33am
Yes, this is a QUAD CHANNEL kit purchased from Amazon (HX424C15FBK4 - as per the ASRock Taichi Memory QVL). I double checked the sticks and the serial numbers are consecutive. Here is another screenshot showing that Windows can't see the memory but CPUZ can... http://imgur.com/gvNaEyW |
Posted By: Xaltar
Date Posted: 22 Dec 2016 at 3:40am
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I am inclined to agree with you that it may be the CPU. The telling detail in that CPUz screenshot is the "dual channel" rather than "Quad Channel" under "Channel #". The fact that the RAM is being detected means it is unlikely the slots themselves which is typically what is wrong when the board is at fault. -------------
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Posted By: wardog
Date Posted: 22 Dec 2016 at 4:18am
I'm almost there too. Diagnosing over the internet sux. OP, if you're not tired on me yet, in CPU-z's SPD tab, look that all four sticks have the same timings and voltage displayed. Too, look at each sticks SPD tab and see if there are any irregularities noted between the four sticks. Experience says this is sometimes/usually related to mismatched sticks. Hence my continued badgering. If they are the same, then I'll bow and agree it's most likely the CPU. |
Posted By: blark
Date Posted: 02 Jan 2017 at 9:13am
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I RMA'd the CPU ... that was the issue, I put an i7 6800k in and it worked fine right away. Thanks to everyone for all the help.
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Posted By: swdluxxer
Date Posted: 02 Jan 2017 at 9:49am
Hi  i will help to everyone wo will use more as 16 Gb of Ram at Ram Speed more as 2400. 1. Go to Bios and find "FIVR Configuration" 2. Find and set your "System Agent Offset" to "0.0300" 3. Save Bios and Restart your Computer. now you can use more as 16Gb of Ram at higher Speed like 2666 And more, without any Problem. To ASRock - please make it easy for everyone at next Bios Update for X99 Boards and set this "Offset" automaticaly a little bit higher if Mainboard have detect more Ram at higher Speed like a 2666+ Have a nice Day, your swdluxxer
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Posted By: parsec
Date Posted: 02 Jan 2017 at 10:17am
While you are basically correct about adjusting the System Agent (SA) voltage to help with higher speed DDR4 memory, unlike DRAM voltage, more SA voltage is not always better. Note I did not say more SA voltage is never better, it obviously is in your case. I'm saying there is an appropriate amount of SA voltage, and too much can even have a negative affect. Actually what you suggested, automatically setting a higher SA voltage is exactly what mother board manufactures and DDR4 manufactures have done with the Intel Skylake platform. The DDR4 memory's XMP data now has much higher SA voltage levels, 1.2V or more. The mother boards, when SA voltage is set to Auto SA voltage and manually setting a higher memory speed will also set a higher SA voltage. I've seen an Auto SA voltage of over 1.2V on my Skylake board. But I have found that these high SA voltages are not always necessary. That is my point, there is a sweet spot for SA voltage that depends upon the memory being used, and the memory controller, which is part of the CPU. I can manually set the SA voltage to 1.1V at the same memory speed, and it works fine. It's difficult to know the exact SA voltage when you are dealing with offsets in the UEFI settings, but if you try different monitoring programs like AIDA64, HWiNFO, etc, you can find it. Thanks for your tip and feedback about what works for you, that is valuable to users and ASRock. ------------- http://valid.x86.fr/48rujh" rel="nofollow">
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Posted By: parsec
Date Posted: 02 Jan 2017 at 10:27am
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Thank you for telling us about your experience. It is important information, a real world experience and validation. DDR4 at 2400 should not be a difficult memory speed, or OC, for an Intel HEDT processor. But a Xeon is a different animal, and why it won't (apparently?) work with memory speeds not far above its max memory speed spec (2133) is curious. I'm not saying the Xeon should go above 2133, but wondering why is that a hard limit. The i7-6800K memory speed spec is up to 2400. I have 2666 memory running with my i7-6800K, so it can go higher. ------------- http://valid.x86.fr/48rujh" rel="nofollow">
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Posted By: swdluxxer
Date Posted: 02 Jan 2017 at 12:10pm
Hi parsec  you are correct too but set System Agent Offset" in Range "0.0100" --- "0.0300" is not bad for Memory Controller of Cpu`s but will help most Users to going working high Memory Speed (or big Amount of Memory like 32gb +) in all Scenarios(Overclocking and etc. ). Have a test it for more as 30 X99 Cpu´s (5820K,5930K, 6800K, 6900K). |
Posted By: vadimkara
Date Posted: 02 Jan 2017 at 5:54pm
| i had the same issue on te right side slots populate second and forth not first and third!! |