Jump to content

Windows can't detect all RAM

Number A
 Share
Posted

Hi All,

 

I recently bought a set of Corsair Vengeance LP CML8GX3M2A1600C9 to add to my alreadt existing set of Corsair Vengeance CMZ8GX3M2A1600C9 for a total of 16GB of RAM.
Both sets are 2x(4GB) DDR3 with a clockspeed of 1600Mhz.

 

When I check my system information i see that Windows can only detect 12GB of RAM. (image 1)

When I check task manager source control I see that slot 1 is empty. (image 2)

when I run HWinfo I see that my motherboard is currently running in Triple channel BUT it can detect all 4 sticks (image 3

When I check system information I see that windows detects only 12GB of fysical RAM, but it does add up the 16GB of the sticks to the 4GB of Vram from my GPU for a total of 20GB of Virtual memory. (image 4)

 

My specs are:
CPU: Intel I7-3820
GPU: GTX 680 Classified 4GB Vram
Moederboord: Rampage IV Formula (has the latest BIOS version of 5001)
PSU: Antec 900W

 

I also tried both sets seperately in dual channel and then Windows and HWinfo detects them as 8GB, so the sticks are not defect.

And I also tried the 4 sticks in all possible configurations.


Who can help me so Windows detects all 4 sticks?

 

PS. I'm dutch, which is also the language you see in the images. But I think most of you will be able to understand the relevant data of the images.

If any more information is needed feel free to ask.
 

Knipsel.JPG

RAM.png

HWinfo.png

Systeeminformatie.png

Link to comment
https://linustechtips.com/topic/1207975-windows-cant-detect-all-ram/
Share on other sites
Link to post
Share on other sites
Posted
4 minutes ago, Number A said:

Hi All,

 

I recently bought a set of Corsair Vengeance LP CML8GX3M2A1600C9 to add to my alreadt existing set of Corsair Vengeance CMZ8GX3M2A1600C9 for a total of 16GB of RAM.
Both sets are 2x(4GB) DDR3 with a clockspeed of 1600Mhz.

 

When I check my system information i see that Windows can only detect 12GB of RAM. (image 1)

When I check task manager source control I see that slot 1 is empty. (image 2)

when I run HWinfo I see that my motherboard is currently running in Triple channel BUT it can detect all 4 sticks (image 3

When I check system information I see that windows detects only 12GB of fysical RAM, but it does add up the 16GB of the sticks to the 4GB of Vram from my GPU for a total of 20GB of Virtual memory. (image 4)

 

My specs are:
CPU: Intel I7-3820
GPU: GTX 680 Classified 4GB Vram
Moederboord: Rampage IV Formula (has the latest BIOS version of 5001)
PSU: Antec 900W

 

I also tried both sets seperately in dual channel and then Windows and HWinfo detects them as 8GB, so the sticks are not defect.

And I also tried the 4 sticks in all possible configurations.


Who can help me so Windows detects all 4 sticks?

 

PS. I'm dutch, which is also the language you see in the images. But I think most of you will be able to understand the relevant data of the images.

If any more information is needed feel free to ask.
 

 

Can you check if the 4th stick is even detected in the BIOS?

If it is not, then there might be something wrong / faulty with the DIMM slot on the motherboard.

AMD Ryzen 9000 Rig

  • AMD R7 9800X3D + Alphacool CORE 1 w/ Performance Mount Kit + Thermal Grizzly AM5 Contact Frame
  • Gigabyte X870E Aorus Pro Ice
  • 32GB (16GB X2) G.Skill Trident Z5 Neo RGB DDR5-6400
  • Sapphire NITRO+ 6800 XT Special Edition + EKwb Full Cover Block
  • Custom Loop w/ 2x 360mm Radiators
  • WD SN850X + WD SN750 + Samsung 980
  • EVGA P2 850W + Red/White CableMod Cables
  • Lian-Li O11 Dynamic EVO XL

AMD Ryzen 5000 Rig

  • AMD R7-5800X
  • Gigabyte B550 Aorus Pro AC
  • 32GB (16GB X 2) Crucial Ballistix RGB DDR4-3600
  • Gigabyte Vision RTX 3060 Ti OC
  • EKwb D-RGB 360mm AIO
  • Intel 660p NVMe 1TB + Crucial MX500 1TB + WD Black 1TB HDD
  • EVGA P2 850W + White CableMod cables
  • Lian-Li LanCool II Mesh - White

Intel i7-8086K / Z390 Rig (Decommissioned Q2' 2025)

Intel i7-6800K / X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)
Intel i5-4690K / Z97 Rig (Decommissioned)

AMD FX-8350 / 990FX Rig (Decommissioned)

AMD Phenom II X6 1090T / 890FX Rig (Decommissioned)

 

<> Electrical Engineer , B.Eng <>

<> Electronics & Computer Engineering Technologist (Diploma + Advanced Diploma) <>

<> Electronics Engineering Technician for the Canadian Department of National Defence <>

Link to post
Share on other sites
Posted
Just now, -rascal- said:

 

Can you check if the 4th stick is even detected in the BIOS?

If it is not, then there might be something wrong / faulty with the DIMM slot on the motherboard.

^this 

re seat the dimm as well and update the bios 

PC: Motherboard: ASUS B550M TUF-Plus, CPU: Ryzen 3 3100, CPU Cooler: Arctic Freezer 34, GPU: GIGABYTE WindForce GTX1650S, RAM: HyperX Fury RGB 2x8GB 3200 CL16, Case, CoolerMaster MB311L ARGB, Boot Drive: 250GB MX500, Game Drive: WD Blue 1TB 7200RPM HDD.

 

Peripherals: GK61 (Optical Gateron Red) with Mistel White/Orange keycaps, Logitech G102 (Purple), BitWit Ensemble Grey Deskpad. 

 

Audio: Logitech G432, Moondrop Starfield, Mic: Razer Siren Mini (White).

 

Phone: Pixel 3a (Purple-ish).

 

Build Log: 

Link to post
Share on other sites
Posted
  • Author
11 minutes ago, -rascal- said:

 

Can you check if the 4th stick is even detected in the BIOS?

If it is not, then there might be something wrong / faulty with the DIMM slot on the motherboard.

The BIOS also shows 12GB of RAM, but I don't understand how the Vram can be 20GB is one slot is faulty.

Link to post
Share on other sites
Posted
  • Author
2 minutes ago, Number A said:

The BIOS also shows 12GB of RAM, but I don't understand how the Vram can be 20GB is one slot is faulty.

And I also don't understand how HWinfo can detect all 4 sticks for a total of 16GB of RAM if one slot would be faulty.

Link to post
Share on other sites
Posted
Just now, Number A said:

And I also don't understand how HWinfo can detect all 4 sticks for a total of 16GB of RAM if one slot would be faulty.

task manager is often incorrect 

hwinfo64 is alot more accurate 

try re seating  the ram 

PC: Motherboard: ASUS B550M TUF-Plus, CPU: Ryzen 3 3100, CPU Cooler: Arctic Freezer 34, GPU: GIGABYTE WindForce GTX1650S, RAM: HyperX Fury RGB 2x8GB 3200 CL16, Case, CoolerMaster MB311L ARGB, Boot Drive: 250GB MX500, Game Drive: WD Blue 1TB 7200RPM HDD.

 

Peripherals: GK61 (Optical Gateron Red) with Mistel White/Orange keycaps, Logitech G102 (Purple), BitWit Ensemble Grey Deskpad. 

 

Audio: Logitech G432, Moondrop Starfield, Mic: Razer Siren Mini (White).

 

Phone: Pixel 3a (Purple-ish).

 

Build Log: 

Link to post
Share on other sites
Posted
18 minutes ago, Number A said:

The BIOS also shows 12GB of RAM, but I don't understand how the Vram can be 20GB is one slot is faulty.

 

17 minutes ago, Number A said:

BIOS is already updated to the latest version, 5001.

 

14 minutes ago, Number A said:

And I also don't understand how HWinfo can detect all 4 sticks for a total of 16GB of RAM if one slot would be faulty.

 

If BIOS only shows 12GB of RAM, then there may be a physical problem.

Again, can be faulty DIMM slot, or bad RAM stick.

 

 

Virtual Memory =/= Video Memory (VRAM).

Virtual Memory is allocated HDD/SDD storage, where data can be offloaded of of RAM (DRAM), and onto the HDD/SSD.

That amount can be changed...if you have enough system RAM, you *could* set virtual memory to 0MB.

image.png.1220b4561a0941732035a36b1b5a4ec3.png

 

 

There are sense pins on the RAM stick, and on the DIMM slot.

It might be detecting there is something in the slot, but somehow not properly accessible / addressable, etc.

 

I am leaning to something faulty physically on the RAM / DIMM slot / CPU socket (e.g. CPU socket pins going to DRAM).

AMD Ryzen 9000 Rig

  • AMD R7 9800X3D + Alphacool CORE 1 w/ Performance Mount Kit + Thermal Grizzly AM5 Contact Frame
  • Gigabyte X870E Aorus Pro Ice
  • 32GB (16GB X2) G.Skill Trident Z5 Neo RGB DDR5-6400
  • Sapphire NITRO+ 6800 XT Special Edition + EKwb Full Cover Block
  • Custom Loop w/ 2x 360mm Radiators
  • WD SN850X + WD SN750 + Samsung 980
  • EVGA P2 850W + Red/White CableMod Cables
  • Lian-Li O11 Dynamic EVO XL

AMD Ryzen 5000 Rig

  • AMD R7-5800X
  • Gigabyte B550 Aorus Pro AC
  • 32GB (16GB X 2) Crucial Ballistix RGB DDR4-3600
  • Gigabyte Vision RTX 3060 Ti OC
  • EKwb D-RGB 360mm AIO
  • Intel 660p NVMe 1TB + Crucial MX500 1TB + WD Black 1TB HDD
  • EVGA P2 850W + White CableMod cables
  • Lian-Li LanCool II Mesh - White

Intel i7-8086K / Z390 Rig (Decommissioned Q2' 2025)

Intel i7-6800K / X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)
Intel i5-4690K / Z97 Rig (Decommissioned)

AMD FX-8350 / 990FX Rig (Decommissioned)

AMD Phenom II X6 1090T / 890FX Rig (Decommissioned)

 

<> Electrical Engineer , B.Eng <>

<> Electronics & Computer Engineering Technologist (Diploma + Advanced Diploma) <>

<> Electronics Engineering Technician for the Canadian Department of National Defence <>

Link to post
Share on other sites
Posted
  • Author

@TofuHaroto@-rascal-

 

I just tried something different, and I have found that when I run dual channel (1-3) Windows and HWinfo can detect the 8GB fine.
But when i run dual channel (2-4) Windows can only detect 4GB but HWinfo detects 8GB. Also at (2-4) dual channel Windows detected 4GB of phsyical RAM but 13GB of Vram was available. (image 1)


Now I placed all 4 sticks back and HWinfo detects quad channel but Windows can still only detect 12GB. (Image 2)

 

I think i'm going to lose my mind.

Systeeminfo dual channel.png

HWinfo2.png

Link to post
Share on other sites
Posted
  • Author

@TofuHaroto@-rascal-

 

Little update, I just tried 1,2,3 and 4 single channel and the PC didn't boot when on single channel 4. So it would seem slot 4 is faulty.

But what I don't understand is how HWinfo can still detect the RAM in slot 4 when run in dual channel and quad channel.

Link to post
Share on other sites
Posted

@Number A I would agree with @Selle

Take the CPU out of the socket, and inspect both the underside of the CPU, and the CPU socket on the motherboard.

Even a single bent / misaligned pin (depending on which pin that got bent) can cause issues similar to this.

AMD Ryzen 9000 Rig

  • AMD R7 9800X3D + Alphacool CORE 1 w/ Performance Mount Kit + Thermal Grizzly AM5 Contact Frame
  • Gigabyte X870E Aorus Pro Ice
  • 32GB (16GB X2) G.Skill Trident Z5 Neo RGB DDR5-6400
  • Sapphire NITRO+ 6800 XT Special Edition + EKwb Full Cover Block
  • Custom Loop w/ 2x 360mm Radiators
  • WD SN850X + WD SN750 + Samsung 980
  • EVGA P2 850W + Red/White CableMod Cables
  • Lian-Li O11 Dynamic EVO XL

AMD Ryzen 5000 Rig

  • AMD R7-5800X
  • Gigabyte B550 Aorus Pro AC
  • 32GB (16GB X 2) Crucial Ballistix RGB DDR4-3600
  • Gigabyte Vision RTX 3060 Ti OC
  • EKwb D-RGB 360mm AIO
  • Intel 660p NVMe 1TB + Crucial MX500 1TB + WD Black 1TB HDD
  • EVGA P2 850W + White CableMod cables
  • Lian-Li LanCool II Mesh - White

Intel i7-8086K / Z390 Rig (Decommissioned Q2' 2025)

Intel i7-6800K / X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)
Intel i5-4690K / Z97 Rig (Decommissioned)

AMD FX-8350 / 990FX Rig (Decommissioned)

AMD Phenom II X6 1090T / 890FX Rig (Decommissioned)

 

<> Electrical Engineer , B.Eng <>

<> Electronics & Computer Engineering Technologist (Diploma + Advanced Diploma) <>

<> Electronics Engineering Technician for the Canadian Department of National Defence <>

Link to post
Share on other sites
Posted
1 minute ago, Number A said:

Unfortunately the reseat didn't show any improvements.

Make sure there isn't  any memory channels that are not broken / ruined

PC: Motherboard: ASUS B550M TUF-Plus, CPU: Ryzen 3 3100, CPU Cooler: Arctic Freezer 34, GPU: GIGABYTE WindForce GTX1650S, RAM: HyperX Fury RGB 2x8GB 3200 CL16, Case, CoolerMaster MB311L ARGB, Boot Drive: 250GB MX500, Game Drive: WD Blue 1TB 7200RPM HDD.

 

Peripherals: GK61 (Optical Gateron Red) with Mistel White/Orange keycaps, Logitech G102 (Purple), BitWit Ensemble Grey Deskpad. 

 

Audio: Logitech G432, Moondrop Starfield, Mic: Razer Siren Mini (White).

 

Phone: Pixel 3a (Purple-ish).

 

Build Log: 

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing CPUs, Motherboards, and Memory

×