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‎06-13-2017 07:55 AM - edited ‎06-13-2017 08:23 AM

HP Recommended
Product: HP 15-ac122TU
Operating System: Microsoft Windows 10 (64-bit)

I purchased a RAM chip having the following specifications - 4 GB , DDR3L , 1600 Mhz , SO-DIMM , 1.35 V , for my Notebook HP 15-ac122TU, which already has 4 GB pre-installed RAM.  I installed the RAM chip in the 2nd slot of my notebook. But Windows 10 doesn't detect it. The installed RAM still shows up as 4.00 GB instead of 8.00 GB. I also tried msconfig and restarted it. But still it doesn't show up. Please help!

7 people had the same question
3 REPLIES 3

‎06-13-2017 08:31 AM

HP Recommended

Do you have the 14-inch or the 15-inch model?

 

See: https://support.hp.com/us-en/product/hp-14-ac100-notebook-pc-series/8499318/model/8876444/document/c...

 

The 14-inch model is shipped with one 8GB stick, and with an 'ERROR' disk-drive.  :Surprise:

 

Can you put ONLY the "new" stick into your computer, to see if it is detected by itself?

If it is, then put the original RAM into the second slot, to see if it is detected.

 

Do you have the 32-bit version of Windows?  It may show that its maximum (4GB) of RAM is installed.

You need the 64-bit version of Windows to use more than 4GB of RAM.

 

If you start-up the computer, and enter BIOS SETUP, does it show that 8GB is installed?

 

If you start-up the computer, and choose to run the HP Diagnostics, does it test 8GB of RAM?

 

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‎06-13-2017 10:06 AM

HP Recommended
  • I have the 15-inch model
  • I am running 64-bit windows (x64)

I entered the BIOS and Diagnostics, but it showed 4 GB.

 

In order to test the new RAM, I removed the original RAM and tried to start using only the new RAM. But the PC didn't start and the CAPS LOCK LED blinked.

 

Finally, I exchanged the two RAM slots (old in new and new in old) and restarted.

 

Fortunately, it worked!! Now I have 8.00 GB showing up.

 

I don't know why this happened. This seems a weird error to me. 

I hope such a thing never happens again.

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‎06-13-2017 10:45 AM

HP Recommended

> I don't know why this happened. 

 

The motherboard is assuming that the speed of the first stick of RAM is the speed of the second stick of RAM.

So, you must have finally put the "slower" RAM into the first slot, and the "faster" RAM into the second slot.

The faster RAM can "underclock" itself down to the speed of the slower RAM, but not vice-versa.

 

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