Only half of RAM is used on AB350 Pro4

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   Hello,

   I
 can't use my whole RAM capacity !

I have a 16GB kit (4x8GB) and only 
8GB usable in windows 10 and the other 8GB is "Hardware Reserved". 

In bios the 4 DIMMs was detected properly with the correct capacity.

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AsiliS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Sep 2018 Location: France Status: Offline Points: 11	Post Options Post Reply Quote AsiliS Report Post Thanks(0) Quote Reply Topic: Only half of RAM is used on AB350 Pro4 Posted: 03 Sep 2018 at 6:06am
	Hello, I can't use my whole RAM capacity ! I have a 16GB kit (4x8GB) and only 8GB usable in windows 10 and the other 8GB is "Hardware Reserved". In bios the 4 DIMMs was detected properly with the correct capacity.

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: 03 Sep 2018 at 7:25am
	most probable is the ram sticks are not properly inserted into the slots (this has been quite common on ryzen boards) second place to look is the actual cpu seating, this also has been a problem worst case is slightly bent pins. usual case (if it is the cpu seating is a remove-refit makes the contact clean) TRY THE RAM FIRST ! another clue might be the bios says 'single channel' this would point more likely to bad insertation of the ram sticks
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AsiliS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Sep 2018 Location: France Status: Offline Points: 11	Post Options Post Reply Quote AsiliS Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 7:50am
	Indeed, the bios displays 'single channel' ! Yet I checked and still checked, the RAMs are properly installed. The BIOS detects them very well too. I searched a little on the web. Apparently, it's related to Memory Remapping but I did't understand everything. There is my configuration : CPU : AMD Ryzen 5 2600X GPU: GeForce GTX 1060 RAM : DDR4 HyperX Fury, 4 x 4 Gb (Sorry for the mistakes, I don't speak English very well) Thanks you. Edited by AsiliS - 03 Sep 2018 at 7:53am

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: 03 Sep 2018 at 7:28pm
	ok carefully remove the cpu visually check for slightly bent pins (or maybe some excess thermal paste on pins) and then reseat the cpu into socket p.s. if the bios was detecting them properly, it wouldnt be saying 'single channel' it would say double channel Edited by datonyb - 03 Sep 2018 at 7:30pm
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AsiliS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Sep 2018 Location: France Status: Offline Points: 11	Post Options Post Reply Quote AsiliS Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 8:37pm
	Done, I checked the CPU. The problem doesn't seem to be that :/ I also tested with two of 8 GB. Again, the problem was the same, only 8 usable

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: 03 Sep 2018 at 8:40pm
	ok so now move onto testing the ram and the slots one at a time one stick in slot a2 check it reads 4gb next stick check that untill all four sticks have been checked in slot a2 if all 4 sticks are ok next test one stick in slot a1 then b1 then b2 see what happens
	[url=https://valid.x86.fr/jpg250][/url] 3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold

AsiliS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Sep 2018 Location: France Status: Offline Points: 11	Post Options Post Reply Quote AsiliS Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 8:50pm
	Done! I think the problem is not hardware but software. All components seem to work properly

AsiliS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Sep 2018 Location: France Status: Offline Points: 11	Post Options Post Reply Quote AsiliS Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 8:55pm
	I just tried with two of 4 GB (so 8GB) and only 4 GB are usable. So it's either Windows or the BIOS that limits

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: 03 Sep 2018 at 9:15pm
	so ? all 4 stick show 4gb when inserted by themselves into slot a2 ? and all 4 sticks also show 4gb when inserted by themselves into slot a1/b1/b2 ? so you have proved each stick works properly in each slot on its own ? if so i would be inclined to presume a fault with either the cpu or the board have you also reset the bios to defaults ?
	[url=https://valid.x86.fr/jpg250][/url] 3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold

AsiliS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Sep 2018 Location: France Status: Offline Points: 11	Post Options Post Reply Quote AsiliS Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 9:33pm
	Yes. If I put one stick (so 4GB) I can use 4 GO. There is not RAM reserved. Let's try to reset the bios !