"Installed" Physical Memory is half what I actually have on MOB

Keystone4132 · Mar 28, 2017

Homebuilt PC Jan '16
Win 7 64 bit
MOB: Asus z97-A
RAM: Corsair Vengeance (2x8g) CMZ16GX3M2A1600C11

I am a heavy Lightroom user. Noticed a slowdown yesterday, pulled up Resource Monitor and saw Used Memory 80-100%. Process hogs were: Lightroom, CrashPlan and MBAM. Thought that was strange given I have 16G RAM onboard and haven't had this much of a poor performance issue with Lightroom before.

Pulled up Windows System and saw "Installed memory (RAM): 8.00 GB". Hmmm, actual memory is 16GB but Installed Memory is 8GB? Must have a bad stick. Ran Windows Memory Diagnostics, two times (4 passes). No errors/problems.

Any ideas what is going on? What would you do next?

ahnilated · Mar 28, 2017

Run Memtest86 on the system and make sure it sees all 16G and there are no errors.

ko888 · Mar 28, 2017

How much memory is detected within the motherboard's UEFI Setup? If the motherboard can't detect 16GB then the Operating System definitely won't.

Rogue Leader · Mar 28, 2017

Try pulling one memory DIMM, see if it boots, then swap for the other and boot.

Very rare but possible that it failed, or the slot failed.

Keystone4132 · Mar 28, 2017

ko888 :

Thanks for all three responses. My son has my only thumbdrive at school so I was not able to try Memtest86. However, I did the following:

Rebooted into ASUS UEFI setup and found:
DRAM Status
DIMM_A1: N/A
DIMM_A2: Corsair 8192MB 1333MHz
DIMM_B1: N/A
DIMM_B2: N/A

I know when I initially built the PC in early 2016 that the stick in B1 was active, so this suggests a defective stick or slot. As suggested by Rogue Leader, I then pulled the stick in A2 out and installed the suspect stick in that slot. On power on, I got the repeated beeps. I then reinstalled only the original A2 stick back in that slot and left the suspect stick out and tried to reboot. I didn't get the repeating beeps, but it would only boot into an ASUS message forcing me into SETUP.

So, can I conclude the stick originally in B2 has failed?

If so, given the caution on this forum about mixing sticks is the best course of action to replace both sticks with a matched set?

Rogue Leader · Mar 28, 2017

Thats what I would conclude as well.

Now as for replacing it, you could try to buy the identical stick, but theres a chance they won't play well together. Corsair uses various companies for their memory and being its over a year later theres a possibility it even has completely different chips on it.

ko888 · Mar 28, 2017

Since Corsair has a lifetime warranty on those DIMMs just initiate an RMA with Corsair.

Keystone4132 · Mar 28, 2017

ko888 :

Thanks for all of the help. I used both of the suggestions from ko888 and Rogue Leader. If there is a way to select both as Best Answers, let me know. In the end I designated ko888 as the best answer because it was the first suggestion that I tried that helped me solve my problem.

Purchased new RAM from Micro Center and am back up and running with 16gb. Thank you!

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"Installed" Physical Memory is half what I actually have on MOB

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Rogue Leader

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