Upgrade Memory on HP Pavillion 15-au063nr Laptop

[chrisV108]

I have an HP Pavillion 15-au063nr with 12 Gb installed RAM (4gb in slot 1 and 8 Gb in slot2) - 2133 mhz 1.2v DDR4 SHARED SODIMMs. I wish to replace the 4GB memory with an 8GB stick. However I am finding the bus speed is 2400 mhz, and instead of SHARED I am finding SINGLE RANK. 

1. Do I need to replace both slots to make it work or can I mix a SHARED with a SINGLE RANK chip set?

2. Is it ok to use a 2400 Mhz chip set ?

3. 

[banhien]

@chrisV108 

The best option for dual channels architecture is use the SAME RAM of existing 8GB. The following tool with show you what it is,    (Looks at SPD tab)

                    https://www.cpuid.com/downloads/cpu-z/cpu-z_1.95-en.exe

Otherwise use the compatible RAM, normally they are 2400MHz ticks and will run at 2133MHz.

Regards.

[chrisV108]

BH

 Thanks for the Solution - One question,  when I look at the SPD tab it shows Rank = Single. Could you explain what that implies?

Chris