ddr4 ram

[Musaid]

What does the number 2666 which was mentioned on my ram ( 4gb 1Rx16 pc4 - 2666v-sco-11)  indicates?

Kingston or crucial ,which one is better for hp 15 bs.? 

Does 8 gb compatible with a 4gb?

I found a Kingston 2400 MHz and Kingston 2666 MHz non ECC DDR4 in amazon. Which one is better in this case? 

[banhien · Accepted solution]

@Musaid 

2666 means 2666 MHz and 2400 means 2400 MHz. Normally 2666 is faster BUT you need a machine which supports 2666 MHz. You may be able to install 2666 MHz RAM on 2400 MHz machines BUT machines won't run at 2666 MHz speed.

>>>> Kingston or crucial ,which one is better for hp 15 bs.? 

Well, it depends, you can't say which one is better,

>>>> Does 8 gb compatible with a 4gb?

I don't know what do you mean. You can install 4GB one one slot and 8GB on the second slot but RAM won't run as dual channels

>>>> I found a Kingston 2400 MHz and Kingston 2666 MHz non ECC DDR4 in amazon. Which one is better in this case? 

Please read my reply above. It depends, faster does not mean better.

Regards.