Only half of RAM is used on AB350 Pro4

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   I can?�t use my whole RAM capacity. I tried a 16GB kit (2x8GB) and only 8GB usable in windows 10 and the other 8GB is "Hardware Reserved". The 16GB RAM kit is actually listed in the memory QVL (CMK16GX4M2A2666C16) of the motherboard.
In bios the 2 DIMMs was detected properly with the correct capacity.

Can someone help me, thanks.

Edited by y2000_lion - 05 Sep 2017 at 2:17pm

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y2000_lion Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 06 Aug 2017 Status: Offline Points: 3	Post Options Post Reply Quote y2000_lion Report Post Thanks(0) Quote Reply Topic: Only half of RAM is used on AB350 Pro4 Posted: 05 Sep 2017 at 2:17pm
	I can?�t use my whole RAM capacity. I tried a 16GB kit (2x8GB) and only 8GB usable in windows 10 and the other 8GB is "Hardware Reserved". The 16GB RAM kit is actually listed in the memory QVL (CMK16GX4M2A2666C16) of the motherboard. In bios the 2 DIMMs was detected properly with the correct capacity. Can someone help me, thanks. Edited by y2000_lion - 05 Sep 2017 at 2:17pm

Maddreg Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Aug 2017 Status: Offline Points: 32	Post Options Post Reply Quote Maddreg Report Post Thanks(0) Quote Reply Posted: 05 Sep 2017 at 2:54pm
	did you put ram sticks into A2B2 slots?
	ASRock AB350M Pro4//Ryzen R6 1600@3800=1.275v+Macho rev.B//GTX 1060//Ripjaws V@3200 16-18-18-38-56=1.4v (2x8Gb)//Corsair RM550x

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8532	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Posted: 05 Sep 2017 at 3:06pm
	Dear y2000_lion, Greetings, this is ASRock TSD. We install the same system configuration to perform the test. [Config.] CPU: AMD Ryzen 5 1400 DRAM: Corsair CMK16GX4M2A2666C16 (2x8GB) BIOS: P3.00 OS: Windows 10 64bit Please refer our test result, the memory size can be detected normally under Win10 64-bit. Regarding this symptom, we provide some suggestions for verifying: 1. Please refer to the user manual (page.25) to clear CMOS (Please shut down the AC power). Link: http://asrock.pc.cdn.bitgravity.com/Manual/AB350%20Pro4.pdf 2. Please only install the necessary devices (CPU, one stick memory, system disk and VGA card) to verify. 3. Please re-install memory to the system and install one stick memory to another slots.(A1,A2,B1,B2) 4. Please clean the Goldfinger parts of memory to verify. 5. If possible, please install another CPU and memory to the system. Thanks! All the best, ASRock TSD Edited by ASRock_TSD - 05 Sep 2017 at 3:07pm

Ricky Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 25 Jun 2017 Status: Offline Points: 43	Post Options Post Reply Quote Ricky Report Post Thanks(0) Quote Reply Posted: 05 Sep 2017 at 3:09pm
	just fyi, last time i experience this issue. It turn out one of the RAM stick is defective.

datonyb Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 11 Apr 2017 Location: London U.K. Status: Offline Points: 3139	Post Options Post Reply Quote datonyb Report Post Thanks(0) Quote Reply Posted: 06 Sep 2017 at 12:52am
	also can be the ram stick wasnt inserted fully weve had several threads solved by reinserting the ram with a bit more force and checking for the double click sound
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