Asrock X99 Extreme11 reports only 48GB
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=5247
Printed Date: 26 Jul 2025 at 3:28pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Asrock X99 Extreme11 reports only 48GB
Posted By: lmax25
Subject: Asrock X99 Extreme11 reports only 48GB
Date Posted: 29 May 2017 at 4:25am
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Hello ! My new Asrock X99 Extreme11 MB reports only 48GB of RAM instead of 64GB of RAM. I have Bios version 3.20. I installed HyperX Savage Black 64GB DDR4 2400MHz CL14 Quad Channel Kit manufacturer code : HX424C14SBK4/64 and CPU Intel® Core??i7-6850K, 3.60GHz , Broadwell, 15MB, Socket 2011-V3 Please tell me how to configure the RAM from BIOS to use all 64 GB of RAM installed. Thank You !
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Replies:
Posted By: parsec
Date Posted: 29 May 2017 at 9:24am
"Missing memory" is not uncommon when larger capacities are used on X99 systems. If only it was just some option settings that would easily fix the issue, but that is not a given. Apparently one DIMM is not being recognized, have you identified the memory slot in which it is mounted? What is telling you that only 48GB is being recognized? Windows? The UEFI/BIOS? Both? If you open Resource Monitor in Windows, Memory tab, what is shown? Not much information given in your post, so mostly questions at this point. Which DIMM slots are you using, the A1, B1, etc, or A2, B2, etc? All default or Auto basic memory option settings in the UEFI/BIOS? What speed is the memory operating at currently? Did you enable the XMP profile? Is 48GB only recognized at both 2133 and 2400 memory speeds? Have you done any testing to verify that all four of the DIMMs in the memory kit are working? Initial UEFI/BIOS option settings to set and try are: OC Tweaker, Voltage Configuration screen: Set DRAM Voltage to 1.25V - 1.3V - 1.35V, in steps and check if the memory is recognized. Start with 1.3V and if that works you can try to reduce it to 1.25V. OC Tweaker, DRAM Configuration screen: At the very bottom of this screen, find MRC Fast Boot, and set it to Disabled. Next, find Memory Test, and set it to Enabled. You do not need to leave these option set this way permanently, but at least for several restarts/boots of the PC to allow memory training and testing to occur. ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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lmax25 wrote:Posted By: lmax25
Date Posted: 30 May 2017 at 12:32am
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BIOS reports only 48 GB of RAM instead of 64 GB. (see attached photo) The memory module from D1 slot is reported on starting screen as blank (I switched memory modules and all 4 are working fine) But the System Browser Utility from BIOS reports that all 4 DDR4 memory slots A1,B1,C1,D1 have each one a memory module installed. (see attached photos) Windows 7 Ultimate +SP1 X64 bit system reports only 48 GB of RAM instead of 64 GB (I installed all 4 memory modules on slots A1,B1,C1,D1) (see attached photo) AIDA64 reports all 4 memory modules on slots A1,B1,C1,D1. (see attached photo) Please tell me what to do with the fourth DDR4 memory module because after I installed Windows and all the updates, my system starts crashing... How can I solve the memory problem ? Thank You ! I set MRC Fast Boot to DISABLED I set Memory Test to ENABLED Here you will find some screen capture files that may help : https://www.google.com/url%3cq=https%3A%2F%2Fwe.tl%2FOoVehGxw4a&sa=D&sntz=1&usg=AFQjCNHI88jyeI3sRzBnEk12hlhbRDb2bw" rel="nofollow - https://www.google.com/url?q=https%3A%2F%2Fwe.tl%2FOoVehGxw4a&sa=D&sntz=1&usg=AFQjCNHI88jyeI3sRzBnEk12hlhbRDb2bw
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