Upgrading RAM memory on HP Pavilon 15-bs158sa

[BigDoubleD]

Hi my  HP Pavilon 15-bs158sa is working very slow  so I've decided to upgrade RAM memory on it.

At the moment there is 4GB  DDR4 RAM 2400Mhz Samsung installed.

I was planing to upgrade it to 12 or 16GB

after long search on  internet to find out what type of RAM memory is needed  i think i got idea but before buying it I would like to double check with experts if I'm right.

So as I understand it will be better to buy 16GB new memory rather then adding 8GB to existing 4GB?

Is it better to buy 1x16GB or 2x8 ?

does my laptop support higher frequency  like 2666Mz or will  should I stick to whats installed?

What do you think of these two :

Timetec Hynix IC DDR4 2400MHz PC4-19200 Unbuffered Non-ECC 1.2V CL17 2Rx8 Dual Rank 260 Pin SODIMM

Crucial Ballistix BL2K8G26C16S4B 2666 MHz, DDR4, DRAM, Laptop Gaming Memory Kit, 16GB (8GB x2), CL16

Thanks for any advice

[banhien]

@BigDoubleD 

Its specs:

        https://support.hp.com/au-en/document/c05817137

It has 4GB of RAM now, you can upgrade to

   (a)  8GB; add SAME existing RAM to slot 2 or using the following compatible RAM

                    https://www.crucial.com/memory/ddr4/ct4g4sfs824a/ct11613163

   (b) 12GB: (not recommended): add 8GB to slot 2 using the following compatible RAM

                    https://www.crucial.com/memory/ddr4/ct8g4sfs824a/ct11613175

   (c) 16GB (max): install 8GB each to both slots using

                    https://www.crucial.com/memory/ddr4/ct2k8g4sfs824a/ct11613134

       or         https://www.crucial.com/memory/ddr4/bl2k8g26c16s4b/ct16753091     (will run at 2400MHz)

Regards.

[BigDoubleD]

Does it mean that higher frequency RAM cards aren't  compatible with this laptop? or i can get higher frequency one but its still gonna run at 2400Mhz? And one more question... those cards are 260 pin type right?

Thanks for the reply

Regards