RAM not all showing up

Don't know how long this has been going on but I'm guessing it happened after I updated my bios. I have 16gb ram installed, bios and windows only show 8gb it used to show all 16 but now it does not. All 16gb show up in CPU-Z but no where else. I have tried all 4 sticks in different slots and different configurations and all slots work and all sticks work just not all together. My set up is:

MB: ASRock P67 Extreme 6
Bios: P2.10
Windows 10 home 64bit
CPU: i7 2600k
Ram: G.Skill PC3-12800 4 sticks at 4gb each

Like I said it has worked in the past but was having some other issues so I updated my Bios about a month ago and not sure if thats when it stopped recognizing it or if it stopped before that.

B4Real wrote: Don't know how long this has been going on but I'm guessing it happened after I updated my bios. I have 16gb ram installed, bios and windows only show 8gb it used to show all 16 but now it does not. All 16gb show up in CPU-Z but no where else. I have tried all 4 sticks in different slots and different configurations and all slots work and all sticks work just not all together. My set up is: MB: ASRock P67 Extreme 6 Bios: P2.10 Windows 10 home 64bit CPU: i7 2600k Ram: G.Skill PC3-12800 4 sticks at 4gb each Like I said it has worked in the past but was having some other issues so I updated my Bios about a month ago and not sure if thats when it stopped recognizing it or if it stopped before that. *Also posted on Tom's Hardware

Not knowing when the missing memory situation happened makes it more difficult to diagnose, of course.

Two things catch my attention as potential causes, or are related to your situation:

Updating the UEFI/BIOS. UEFI 2.10 is the Ivy Bridge processor compatibility update, any you have a Sandy Bridge CPU. It's not wrong to use 2.10 with your CPU, but as the warning in that update say, you must at least update the Intel Management Engine (IME) software. Did you do that? That is also related to the next thing, below.

Using Windows 10. When did you start using Windows 10? Is your Windows 10 installation an update, or a fresh, new Win 10 installation? Whether an update of new installation, you should download and install the INF driver ver:10.1.1.8, and Intel Management Engine driver ver:11.0.0.1156, installation programs from your board's download page (the forum's link creation tool is having issues, I can only link to your board's main page):

http://www.asrock.com/mb/Intel/P67%20Extreme6/

Missing memory, less being recognized than installed, can be caused by the memory speed being to high, and/or the DRAM voltage being to low.

First try to simply get all your memory recognized. If you are using the XMP profile now, disable it and set the memory speed to Auto, as well as all the memory latency and other memory settings. We don't know what DRAM voltage setting you are using, at first try Auto. If that does not work, try increasing it by 0.5V. Sometimes the voltage setting and the actual, resulting voltage can be different. If your H/W Monitor screen does not show the DRAM voltage, find another program that does, as CPU-Z or HWiNFO64.

If you can get all your memory recognized, then try using the XMP profile, or increasing the speed and latency options manually. Do changes in small steps, and save working changes in a profile in the UEFI. The VCCSA and VTT voltages can also help with memory, small increases are usually the most that is needed.

Your board also has a Beta UEFI version, L2.19, that improves memory compatibility. That UEFI may have fixes that will help with your memory issue.

The time of the last UEFI update and the start of using Windows 10, we don't know, but clearing the UEFI/CMOS with Windows 10 installed, is a good idea. Windows 10 slips in updates all the time, and who knows what affect they have. Your P67 system is on the border line between good Win 10 compatibility with newer systems, and questionable or less than optimal compatibility for earlier systems. The further back in time we go from Sandy Bridge chipset boards (yours), the more compatibility issues we see with Win 10.

B4Real wrote: Yes I have updated all my Intel drivers.  My memory all shows up in CPU-Z so it's not missing but it does not show up anywhere else (bios,system) when I go into my BIOS I don't even have the XMP option, I have tried both the BIOS 2.10 and BIOS 2.19 XMP does not show up in either BIOS, is there anywhere I can get the old BIOS from and use that, I know that one works because my memory used to all show up.

What "old' BIOS, and I'll post a link to it here as soon as I get a response.

I don't see a 2.00 or 1.90

Below is the Instant Flash ver. of 1.80
http://www30.zippyshare.com/v/Y9lny9dY/file.html

Below is the Instant Flash ver. of 1.70
http://www30.zippyshare.com/v/cYA6dXit/file.html

Yea, unpack the file. Then move it to the root of a formatted FAT32 USB stick, inserted into a USB 2.0 port at the back of the computer at the rear I/O panel.

That help?