CPU-Z sees 32GB ram, Windows 10 sees 16

I've had two 8 gig sticks in slots 1&3 for some time. Bought 2 more of the exact same Crucial ram sticks and plugged them into slots 2&4. Bios sees 32, Windows 10 sees 16 still. CPU-Z also sees all 4 of the sticks and reports 32G.

Tried using just the new sticks in slots 2&4. Sees both.
Tried using just the new sticks in slots 1&3. Sees both.

Updated all the drivers, except the latest Windows 10 update - can't do that right now because I would have to uninstall an application it doesn't like.

"BOOT Advanced Options" doesn't have a max memory limit set.

MB is ECS Z87H3-A3X.

Josey Wales said:

Ram Has to be installed in a pre designed order of your MOBO.

All the sticks are exactly the same. Don't know how I'd change the order.

Josey Wales said:

You could try a Ram test from Windows 10 but it takes about 45 minutes.

Good thought. I'll kick that off later tonight.

Yep. 4 slots, 4 sticks.

Yep, checked the BOOT Advanced Options already. No limit.

-https://www.tenforums.com/drivers-hardware/113180-windows-wont-recognize-half-my-ram.html

Remove your cpu and clean the contacts.

boombastik said:

-https://www.tenforums.com/drivers-hardware/113180-windows-wont-recognize-half-my-ram.html

Remove your cpu and clean the contacts.

Yeah, I read that thread. I was afraid I might have to do that. His is a little different - two of his slots were dead (at least to Windows). All my slots work but only two at a time :-D

I'll try the ram test first - and flashing the firmware. Rather not remove the CPU unless I have to. I'd have to pick up some thermal paste first.

it might help if you posted task manager's view of the RAM