Upgrading Ram

[RICKinFL]

My model # is a  HP 580- 23w and I'm looking to up grade my Ram from 8GB (2-4GB sticks) to 16GB. My question is do I have to   buy 2- 8GB sticks and use as a pair or can I just buy 1 16GB stick of memory and us only 1 bay?  Any help would be greatly appreciated.

[Prométhée]

Hello

this is a recorded response (macro))
we need the exact model of your computer, and the product number
To find it follow this
for a desktop computer

HP Desktop PCs - How Do I Find My Model Number or Product Number? | HP® Customer Support

[RICKinFL]

Here are my numbers you wanted .......Product name is 580- 023w and Product number is Z5N95AA#ABA Hope this helps.

[Prométhée · Accepted solution]

 HP Pavilion Power 580-023w Desktop PC Product Specifications

8 GB

• Amount: 8 GB
• Speed: PC4-19200 MB/s
• Type: DDR4-2400

then fine you have already checked, because here they do not say the number of modules

motherboard specifications, Odense2-K

• Dual channel (one DIMM per channel) memory architecture
• Two DDR4 UDIMM (288-pin) sockets
• Supports PC4-19200 (DDR4-2400)
• Supports 4 GB and 8 GB UDIMMs
• Supports up to 4 GB on 32-bit systems

  note:

  32-bit systems cannot address a full 4.0 GB of memory.

• Supports up to 16 GB (unbuffered) on 64-bit computers

as you can see it says 16gb
and only with 2 * 8gb
This is what is recommended, tested, validated by hp ..
in rare cases, more than what is mentioned can be installed
But 16gb is enough for many users

if not, you can check with the site, Welcome to Crucial USA 

but even if they offer something else it doesn't always mean it's ok, it does mention it

* Do not exceed the amount of memory recommended by the manufacturer.

[RICKinFL]

Thank you for the Information. From what you posted it looks like I need to use 2- 8gb. Thanks again for your help.