Asus Z170-A not activating second RAM slots to be visible inside Windows

jhandley8250 · Mar 22, 2017

Just got a computer in that I'm working on getting setup, and it's got an Asus Z170-A motherboard with 4x4GB Corsair RAM that are all from a 16GB pack. I've made sure that they all match in speeds, and they're definitely designed to work together. When I booted into Windows 10 Pro, I've only got 8GB of RAM showing as active, so I assume that something in the BIOS is not activating the secondary RAM slots on the motherboard. I went through the BIOS and set just about everything to auto, but still no luck in getting the system to send all 16GB of RAM to Windows.

Anyone else had that issue? I'm looking through the BIOS but getting a bit confused with the variety of profiles, customization options, and what have you. I'm not as up to speed on finer tuning of systems built for gaming/graphics by overclocking the hardware, so I'm feeling a little bit out of my depth.

Thanks in advance for responses! Really glad I found this site as there seems to be a wealth of info here I can tap into.

romirez · Mar 23, 2017

Check Physical Memory Limits: Windows 10
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sucroc · Aug 26, 2017

jhandley8250 :

Just got a computer in that I'm working on getting setup, and it's got an Asus Z170-A motherboard with 4x4GB Corsair RAM that are all from a 16GB pack. I've made sure that they all match in speeds, and they're definitely designed to work together. When I booted into Windows 10 Pro, I've only got 8GB of RAM showing as active, so I assume that something in the BIOS is not activating the secondary RAM slots on the motherboard. I went through the BIOS and set just about everything to auto, but still no luck in getting the system to send all 16GB of RAM to Windows.

Anyone else had that issue? I'm looking through the BIOS but getting a bit confused with the variety of profiles, customization options, and what have you. I'm not as up to speed on finer tuning of systems built for gaming/graphics by overclocking the hardware, so I'm feeling a little bit out of my depth.

Thanks in advance for responses! Really glad I found this site as there seems to be a wealth of info here I can tap into.

sucroc · Aug 26, 2017

I had the exact same problem. MOBO ASUS Z170-A would only see channel A (2 slots closest to CPU). Absolutely wont see channel B. I had no ability to get dual channel memory, as that requires a ram chip in A1 and B1 or A2 and B2. I had to RMA the MOBO. It turns out my MOBO was already RMAd for same problem and ASUS said it checked good. Unbelieveable! Need to Return your board. I got another MOBO ASUS Z1790A and the memory works fine. Only problem is, multiple BSOD crashes with i7-7700K cpu and win 10 creator update. I have been playing with the registry and changing startup of services like cldflt, scheduler, and turned metered network to on. This has helped a little and I continue to TSS. I also had to change the bios security uefi to uefi OS (after installing as Other OS). In addition, I had to buy a gen 6 g4400 pentium and upgrade the bios to 3504, install win 10 pro 64 ver 1703, rename intellppm.sys to intelppm.sht under c:\windows\system32\drivers, uninstall the graphic adapter, network adapter, and both cpu cores from bottom core to top core in device manager. Shutdown PC, install i7-7700K and restart, validate license and immediately turn metered network to on (under network, wifi,manage known networks, -router name-(what your router is called), set metered connection on (to prevent any microsoft updates) as KB4034694 is an instant PC killer. I now download 1 update at a time and manually install. In addition, I ran the z170-a install disk, drivers with google chrome and antivirus de checked. Good Luck! You will need it!

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