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installed 16GB memory only work 7.95GB usable Printed From: ASRock.com Category: Technical Support Forum Name: AMD Motherboards Forum Description: Question about ASRock AMD motherboards URL: https://forum.asrock.com/forum_posts.asp?TID=13868 Printed Date: 16 Oct 2026 at 5:56pm Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com Topic: installed 16GB memory only work 7.95GB usable Posted By: Aerius Subject: installed 16GB memory only work 7.95GB usable Date Posted: 17 Mar 2020 at 12:06pm As title, clean win10 os and 2 8gb memory installed on B450M Steel Legend. Under os, installed memory display 16.0 GB but shows 7.95GB usable. How to fix this issue for more usable memory, please help! Regards. Replies: Posted By: ThreeDee Date Posted: 17 Mar 2020 at 12:37pm memory installed in A2 & B2 slots? ------------- |Ryzen 5 5900|ASRock X570 Taichi-BIOS 4.60|2x16GB HyperX Predator RGB 3200@3600 1:1 IF|ASRock RX 6700XT|2 x PCIe 4.0 M.2 Drives for OS & Games|850 WTT Seasonic 80+ Titanium PSU|Noctua NH-D15| Posted By: ASRock_TSD Date Posted: 17 Mar 2020 at 4:30pm Dear Aerius, Greetings, this is ASRock TSD. Regarding to this case, please plug the memory to A2/B2 slot and post the system into BIOS setup; load BIOS default setting via[F9] Key and observe if it can improve the usable memory under OS. If the symptom still persists, please install another memory module to verify. Thanks! All the best, ASRock TSD

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