Thank you for being a valued part of the CNET community. As of December 1, 2020, the forums are in read-only format. In early 2021, CNET Forums will no longer be available. We are grateful for the participation and advice you have provided to one another over the years.

Thanks,

CNET Support

Question

32 GB of ram, only 16 is read by bios, windows and ubuntu

Sep 16, 2016 1:10AM PDT

Hi everyone, I have an issue since some years that I have never succeeded to understand on what it depends I have a computer assembled by me with these features:
Processor: Intel i73770
Motherboard: asus P8z77-v deluxe
Ram: 32 GB, corsair CMz32GX3M4X1866C10
GPU: Gainward geforce 680
When I have assembled this pc for some months both windows and ubuntu they was reading 32 GB of ram fully. After some months suddenly it reads 16 GB of ram, from bios also if the rams are 1866 mhz I can take them only maximum to 1600 mhz. I can't understand why I have this issue and how to solve it. I attach to this conversation some screen of cpuz and windows properties.
Thank you for helping

[CENTER]http://imageshack.com/a/img924/2425/64OUPU.pnghttp://imageshack.com/a/img924/2834/tz8T1Z.pnghttp://imageshack.com/a/img921/8213/Cb2HXc.pnghttp://imageshack.com/a/img923/8479/0UmMWX.pnghttp://imageshack.com/a/img924/403/kNv8py.png
[/CENTER]

Discussion is locked

- Collapse -
Answer
Re: motherboard
Sep 16, 2016 1:21AM PDT

If it worked for a few months, and suddenly didn't work anymore while you hadn't changed anything, it's a warranty issue. Back to the shop to have them fix the motherboard.

- Collapse -
can't return
Sep 16, 2016 3:58AM PDT

Yes but also if I want to return to shop I dunno if it's a ram issue, a motherboard issue or processor issue cause I have tried using different slots and you know what it happens? if remove all, and put two 8 GB rams in same colour slots (so blue slots or black slots) computer detects 16 GB, if I put 1 8GB ram in black slot and 1 in blue slot, computer detects 8GB but SPD so CPU-z always detect all ram inserted

- Collapse -
Answer
Ram
Sep 16, 2016 10:53AM PDT

That mobo supports 1600 ram native.
If you want to get to 1866 speed you would need to overclock.

If you put 2 sticks in the same color slots that's single channel.
If you put 1 stick in a black slot and 1 stick in a blue slot that's dual channel.

It would seem the machine is having a problem enabling dual channel.
Which could be bios/mobo/ram.

You can check your bios level against what the asus site has to offer.

- Collapse -
Answer
Short answer.
Sep 16, 2016 11:51AM PDT

If the BIOS doesn't report it, Windows and other OSes can't use it.

Dem's the rules.

Not many boards accept 32GB memory sticks. You can try the motherboard's latest BIOS but http://dlcdnet.asus.com/pub/ASUS/mb/LGA1155/P8Z77-V_DELUXE/P8Z77-V_DELUXE_DRAM_QVL_201406.pdf?_ga=1.153454776.1486314214.1465059439 shows no memory stick over 8GB.

The user manual writes: You may install 1GB, 2GB, 4GB and 8GB unbuffered and non-ECC DDR3 DIMMs into the DIMM sockets"

So here you are. That memory stick is not supported.

- Collapse -
Part#
Sep 16, 2016 2:57PM PDT

The part# of the ram indicates it's a 4x8GB kit.

- Collapse -
I used this number.
Sep 16, 2016 3:46PM PDT
- Collapse -
Answer
solved
Sep 17, 2016 1:16AM PDT

I have solved reflashing ME