Memory Compatibility for HP Notebook

[vasvoudour]

I have AMD A6-9220 APU 2.5 GHz (up to 2.9 GHz) with DDDR4-1866 MHz  memory of 4GB.

Do i have 2 memory slots?

Is it possible to put another 4GB of DDR4-2400 MHz  if so, or 8GB of DDR4-2400 MHz,  if i finally have one slot and have full compatibility and operability?

The same holds good for or DDR4-2133 MHz?

It is difficult to find DDDR4-1866 MHz.

[Huffer]

From the Service Manual:

Memory Two non-customer-accessible/upgradable memory module slots (Intel Core processors) DDR4-1866 dual channel support (DDR4-2400 bridge to DDR4-1866)

Manual

Pages 37-43. The Manual says it takes 8 gigs max in the form of a single DDR4-2400 module (see page 1 under memory) but also says there are two slots but seems to limit that to Intel processors and yours is AMD and the whole Manual is about AMD machines. The images show 2 memory slots (see page 40 in the upper left corner of the image of what is seen when you take off the back cover). 

I am just about sure the actual maximum is 16 gigs and it takes DDR4-2400 SO-DIMM. However, the system downclocks it so it actually runs at DDR4-1866 speed. So you don't need to find DDR4-1866 memory (I agree that would be rare). 

Memory module (DDR4-2400) 8-GB 862398-855 4 GB 862397-855

So, long story short you can probably add a module of DDR4-2400 to have 8 gigs total. Like this one:

4 gb DDR4-2400 single rank module

https://www.amazon.com/Micron-PC4-19200-2400MHz-260-Pin-MTA4ATF51264HZ-2G3B1/dp/B073SK49F2/ref=sr_1_...

I would remove the back cover first and look. Get the 4 gig if you have 2 slots and the 8 gig if you only have one. Sorry I can't be more specific but the Manual is a bit confusing. 

Post back with any questions but please Accept as Solution if this is the answer you were looking for.