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Windows 7 Ultimate Only sees 16GB of Ram when 32GB is installed

Last response: in Memory
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April 19, 2014 6:33:12 PM

New PC Build, got everything working but for some reason windows doesn't recognize all 32GB of installed RAM.
The UEFI sees all 32gb and so does CPU-Z but not windows.
Default UEFI Setting, tried with both XMP enabled and disabled.
msconfig max memory was already unchecked.
Would really appreciate it if anyone could help me solve this issue.
My guess is that the RAM is being used by hardware but i'm not sure.
Here are the computer specs:

OS: Activated windows ultimate 64 Bit
Bios version 1402
Motherboard: Asus Maximus VI Formula
Processor: Intel Core i7- 4770k
Cooler: Cooler Master Hyper 212 EVO
RAM: GSkill ares 32gb
Graphics card: EVGA GTX 680
PSU: Supernova NEX750G
HDD: 1TB
SSD: 256GB Samsung Pro
a b $ Windows 7
a c 1941 } Memory
April 19, 2014 6:58:23 PM

First thought is to make sure it's Win7 Ultimate and not Win7 64 Home Premium (which is limited to 16GB),, next would be to check in MSCONFIG go to the Boot Tab, then Advanced Options and make sure the MAX Memory box is UN-Checked, also try reseating all the sticks firmly
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April 19, 2014 10:19:33 PM

Tradesman1 said:
First thought is to make sure it's Win7 Ultimate and not Win7 64 Home Premium (which is limited to 16GB),, next would be to check in MSCONFIG go to the Boot Tab, then Advanced Options and make sure the MAX Memory box is UN-Checked, also try reseating all the sticks firmly


Certain that the OS is Windows 7 Ultimate 64 Bit
Check msconfig and max memory box was already unchecked
Took the ram in and out didn't help.
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April 20, 2014 3:09:20 AM

Can you see the 32GB in the BIOS? If the BIOS does not see the additional 16GB, Windows won't either.
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April 20, 2014 7:02:45 AM

Boukat Henmar said:
Can you see the 32GB in the BIOS? If the BIOS does not see the additional 16GB, Windows won't either.


The BIOS sees all 32GBs
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a b $ Windows 7
a c 1941 } Memory
April 20, 2014 8:16:06 AM

Will 2 sticks work work in slots 1-3 by themselves? will they work in 2-4 by themselves? Then try other sticks in same config (trying to see if all sticks are good and both memory channels are working) If any problem abovemay be a stick or might be a memory channel... If memory channel could be CPU is out of balance from the CPU cooler being to tight in a corner or on one side or other, can loosen it up some then snug it back down, not overly tight but nice and snug and try
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April 20, 2014 10:54:46 AM

Tradesman1 said:
Will 2 sticks work work in slots 1-3 by themselves? will they work in 2-4 by themselves? Then try other sticks in same config (trying to see if all sticks are good and both memory channels are working) If any problem abovemay be a stick or might be a memory channel... If memory channel could be CPU is out of balance from the CPU cooler being to tight in a corner or on one side or other, can loosen it up some then snug it back down, not overly tight but nice and snug and try


Changing the CPU cooler didn't help.
Tried 2 Sticks in channels 1 - 3 alone
then tried 2 other sticks in channels 2 - 4 alone
It booted perfectly and windows detected all 16GB on each attempt

But still won't recognize all 32 together in windows

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a b $ Windows 7
a c 1941 } Memory
April 20, 2014 2:57:58 PM

Are you positive you have Ultimate ver of Win7, sounds like Home Premium which is limited to 16GB, can check in Control Panel, System, should have version up at the top
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April 20, 2014 3:24:16 PM

Windows 7 Ultimate Service Pack 1
System type: 64-bit Operating System
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a c 518 $ Windows 7
a c 83 } Memory
April 20, 2014 3:29:52 PM

Have you contacted Microsoft?
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a b $ Windows 7
a c 1941 } Memory
April 20, 2014 4:58:39 PM

Might try raising the DRAM voltage to 1.6 and see what happens, (perfectly safe)
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April 20, 2014 5:29:53 PM

Changing the DRAM Voltage to 1.6 didn't help
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a b $ Windows 7
a c 1941 } Memory
April 20, 2014 6:14:01 PM

You've lost me, after all this would think mobo or MC, yet BIOS (mobo) sees all, and CPU (MC) sees it from all slots, yet Win doesn't and it's not being limited in MSCONFIG.......Could you post the advance DRAM timings? Do you know anyone with a rig similar that you can try the sticks in? or know anyone with a 4x sticks set you could borrow to try?
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April 20, 2014 6:33:35 PM

Here you go








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a b $ Windows 7
a c 1941 } Memory
April 20, 2014 7:06:49 PM

All looks good there...Could I see the CPU-Z SPD tab....sorry
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April 20, 2014 7:12:26 PM

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Best solution

a b $ Windows 7
a c 1941 } Memory
April 20, 2014 7:46:56 PM

Don't see anything out of whack, only other thing I can think of off hand would be to pull the CPU and check for bent pins in the socket and reseat the CPU
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May 1, 2014 10:34:43 AM

Figured it out, it ended up being that the onboard ME Chipset failed causing all sorts of problems in windows. Ended up sending the motherboard back and now windows detected all 32GBs.

Thanks for trying to help, this must have been a really random issue that not a lot of people have had.
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a b $ Windows 7
a c 1941 } Memory
May 1, 2014 2:40:33 PM

Haven't run into that (yet ;)  ), hope I don't....Glad all is well now !
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