Half of RAM detected by BIOS

September 27, 2016 at 03:37:10
Specs: Windows 7 Pro x64, Intel Core i7-2600
Hi, similar question appeared here before but with no clear solution.

I had 4 x 4GB RAM working well for more than two years and suddenly I've noticed that Windows detects only 8 GB installed memory. Same information appears in BIOS. It is also possible to check modules installed in particular sockets (in BIOS). Interestingly all 4 sockets are occupied and all the modules seem to be recognized. I've tried:
- each module in A2 slot - WORKS
- two modules in sockets A1&B1 and A2&B2 - WORKS
- three and four modules result in only 8 GB of detected RAM
I also performed memtest86 and no errors were found. My configuration includes:
- Asus P8H67 motherboard with 3801 BIOS (latest)
- G.Skill RipjawsX DDR3 4x4GB 1333MHz CL7 XMP (2 x F3-10666CL7D-8GBXH)
- Intel Core i7-2600 CPU
- Windows 7 Pro 64 bit

Thanks for any tips :)


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September 27, 2016 at 19:13:25
Specs show:
"4 x DIMM, Max. 32GB, DDR3 1333/1066 Hz Non-ECC, Un-buffered Memory
Dual Channel Memory Architecture
Supports Intel® Extreme Memory Profile (XMP)
* According to Intel® SPEC, the Max. 32GB memory capacity can be supported with DIMMs of 8GB (or above). ASUS will update QVL once the DIMMs are available on the market.
* Refer to www.asus.com or user manual for the Memory QVL (Qualified Vendors Lists).
* Due to OS limitation, when installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Install a 64-bit Windows® OS when you want to install 4GB or more memory on the motherboard."
....so it should work fine but maybe a BIOS update may be needed to fully support a later release of RAM capacity or even density RAM Chips. They say they would update 'when available' referring to the 8GB sticks but newer chips on the stick could make it fall under the same update.

Another possibility if they were all recognized originally is to clean off the memory contacts with a clean soft pencil eraser and then pop them in and out of the sockets 5 or 6 times to burnish the contacts.

You have to be a little bit crazy to keep you from going insane.

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