I want to know the characteristics of my RAM

[FannyFoxy]

I want to know how many Hertz of RAM and what you can buy a second bar to increase RAM. Is worth in notebook Kingston hp26d4s9s8mh-8

[Huffer]

Not sure what you are asking "is worth"?? However, as you can see on the module it is DDR4-2666 SO-DIMM which is what that Kingston module you ask about is. So yes you can use a Kingston  hp26d4s9s8mh-8, which is what you have now. You do not need to necessarily get a Kingston module. It can be Crucial, Hynix whatever but needs to be DDR4-2666. This type of memory runs at 1333 hz but it is double data rate so the industry calls it 2666 memory. No idea where to tell you to buy it in RF. 

[FannyFoxy]

Is obtained my RAM (Kingston hp26d4s9s8mh-8) betrays 2666 MHz? And the characteristics of this similar Kingston KVR26S19S8/8?

[Huffer]

Stay away from the Value RAM by Kingston. It has a history of not working well with HP laptops. The first sentence of your post makes no sense in English.

[FannyFoxy]

Sorry for my poor English, I wanted to write that this RAM (Kingston KVR26S19S8 / 😎 in terms of characteristics is the same as mine? And if it’s not difficult, could you give an example of which RAM is suitable for my laptop? I’m already tired of looking for information on this topic, as I advise RAM with 2400 MHz, but you write that me need 2666 MHz. I want to buy 8 gigabytes of RAM. And they wrote to me that my laptop supports a maximum of 2400 MHz, help, no one can accurately give information about all aspects of a laptop upgrade.

[Huffer]

The thing is it uses DDR4-2666 memory but it "bridges" (downclocks) to 2400 speed. You still need to try to find DDR4-2666 to mix with the existing module. DDR4-2400 would probably be OK but no reason to take a chance. Yes that KVR26S19S8 is the right TYPE of memory. I just needed to alert you that KVR is made to sell in retail stores so it is made to work in as many systems as possible and sometimes it will not work in HP laptops. Probably a small chance of that in this case.