Supported Ram

[haz007]

Hello!

Can anybody help me?

I want to know the supported Ram to my computer. My computer is HP Notebook 15s-fq1800no with the following hardware:

Motherboard is HP 86c9 version 56.33  

Processor is 1035g4 i5 @ 1,1 ghz

[Paul_Tikkanen]

Hi:

According to chapter 1 of the maintenance and service guide for the 15-sfq1xxx model series, your notebook can support 2 x 8 GB of DDR4-2666 MHz memory.

HP 15s-fq1000 Laptop PC (7BJ15AV) - Setup and User Guides | HP® Support

You can also install DDR4-3200 CL22 MHz memory, but it will only run at 2666 MHz.

If you wanted to install more than 2 x 8 GB of memory in your notebook, you can run this command to see if that would be possible:

1. In the search box, search for cmd and click Run as administrator.

This will open the command prompt.

2. After the command prompt is opened, type wmic memphysical get maxcapacityEx and press the enter key.

There, it will show the maximum RAM capacity your PC's motherboard can support.

The capacity is shown as Kilobytes, so you have to convert it to Gigabytes by dividing the number provided in the report by 1,048,576.

[haz007]

Thanks for your reply

The wmic memphysical get maxcapacityEx command is useful, but it does not show what is the maximum supported speed of the RAM. Is there another command shows that?

What you say is correct. I installed one RAM 16 GB 3200 MHz with the main RAM in the device, which is 8 GB 2667 MHz, so the computer showed me a total capacity of 24 GB and a speed of 2667 MHz.

My question is, is the efficiency of the RAM in this case the same as if I added two RAMs at 2667 MHz?

The computer will work if I put two RAMs, each of them is 16 GB 3200 MHz?

[Paul_Tikkanen]

You're very welcome.

There is no utility that I know of for reporting the maximum speed the memory will run at.

You have to look up the HP notebook specs on the support page, because if you look up the processor memory specs on the Intel website, they are not always the same as what HP indicates, which means HP may have put an unremovable restriction on the memory speed in the BIOS.

For example:  The memory specs on the HP specs page for your notebook indicate that DDR4-2666 MHz memory is supported.

HP Notebook 15s-fq1800no Product Specifications | HP® Support

But Intel indicates the memory speed for your notebook's processor is 3200 MHz.

Intel Core i31005G1 Processor 4M Cache up to 3.40 GHz Product Specifications

The efficiency of the memory is the same (DDR4-3200/DDR4-2666) will all run at 2666 MHz.

Some folks will argue that it takes a few more nanoseconds for the faster DDR4-3200 memory to bridge to 2666 MHz, where a DDR4-2666 MHz memory does not have to make that adjustment.

No doubt you would need specialized equipment to prove that to be true.

I highly doubt you would subjectively notice the difference.

You can install 2 x 16 GB of DDR4-3200 memory in your notebook, and I suggest that sometime down the road you do that because your notebook with 24 GB of memory is still only running the memory in single channel mode.

In order for the memory to run in dual channel mode you have to install the memory in matched capacities in each slot (2 x 4 GB, 2 x 8 GB, 2 x 16 GB...).

[haz007]

Hi!

thanks for your reply
I don't understand what you mean in the last phrase. Is installing two RAMs, 16 GB 3200 MHZ, better in terms of speed, or is the current situation better (8 GB 2667 MH with 16 GB 3200 MH)?

I installed 2 pieces of 16GB RAM 3200 but the computer won't start on, the power light is flashing and the capslock light is flashing. The same thing happened when I removed the 8 GB 2667 RAM, leaving one 16 GB 3200 MHZ RAM.

[Paul_Tikkanen]

You're very welcome,

Whether or not you install DDR4-2666 or DDR4-3200 memory the memory will run at 2666 MHz.

What I was saying is that DDR4-2666 MHz memory does not have to make any adjustments to run at 2666 MHz and DDR4-3200 memory does.

The question is...how much time does it take for the DDR4-3200 memory to make that adjustment to 2666 MHz?

It time would be infintesimal but if you are concerned, buy the 2666 MHz memory.

As far as the notebook not working...

Could be two things...

1. The memory you bought is not compatible.

2. The notebook only supports 2 x 8 GB of memory like the service manual indicates.

To rule out the first possible cause, please post the info about the memory you bought.

Manufacturer, part number CL speed and number of ranks (1Rx8, 2Rx8).

[haz007]

Hello!

Thank you again for reply.

The Ram specificaiton is:

Corsair Vengeance SO-DIMM DDR4 3200Mhz 16GB

EAN; 840006642299

MPN: CMSX16GX4M1A3200C22

SO DIMM 260-pin

CL22 (22-22-22-53)

The laptop is working when the installed Ram is 16GB 3200 MHZ and 8GB 2666 MHZ. But the strnage thing when I just removed the 8GB 2666 MHZ without touching 16GB 3200 MHZ the laptop is not working.  It is not accepting even to start the Bios.

As per the wmic memphysical get maxcapacityEx command the maximum capacity of the laptop Ram is 32 GB  

[Paul_Tikkanen]

You're very welcome.

I don't ever recommend using performance memory in a notebook that came with standard OEM memory.

You don't have a high-performance gaming notebook and even in most of those, HP only installs stock OEM memory.

 The specs for the Corsair memory you bought does not indicate how many ranks it is (1Rx8 or 2Rx8).  The CL 22 speed is OK. 

Corsair SKU sheet template V1. 082509 (rs-online.com)

If it is 1Rx16, then that could be the problem it doesn't work.

If you look at the memory HP installed in your notebook, it is probably 1Rx8.

Then the other possibility is that the notebook only supports 2 x 8 GB of memory regardless of what the Windows command reports.