The questions that I see most often on the HP Forums are regarding upgrading the Processor, Memory or both in a HP Desktop Computer. This is one of the best ways to enhance your new HP computer or breathe new life into your older HP computer. It can enhance system performance considerably. It is generally an excepted rule that the more memory the better.
The best resource for upgrading these components is the Motherboard Specifications page for the computer. This information can be found in the "Processor upgrade information" or "Memory upgrade information" sections of the Motherboard Specifications page. Let's use the Omen by HP-880-160se as an example. Here is the Processor and Memory upgrade information for it:
Processor upgrade information
TDP: up to 95 W
Socket type: LGA 1151
Motherboard supports the following processor upgrades:
Intel Core i7-9700K (Coffee Lake R) 3.6 GHz, Octa Core
Dual channel (2 DIMMs per channel) memory architecture
Four DDR4 UDIMM (288-pin) sockets
Supports PC4-21300 (DDR4-2666) and PC4-19200 (DDR4-2400)
Supports 4 GB, 8 GB, and 16 GB DDR4 UDIMMs
Supports up to 4 GB on 32-bit systems
32-bit systems cannot address a full 4.0 GB of memory.
Supports up to 64 GB (unbuffered) with four 16 GB modules and 32 GB (unbuffered) with four 8 GB modulues on 64-bit computers
Maximum memory shown reflects the capability of the hardware and can be limited further in the operating system.
The information provided in these sections is based on the components being fully tested to assure that they will be compatible with the motherboard. If the Processor or Memory is not on the list it is not recommended to use it. It will most likely NOT be compatible. There have been reports that this information is not always correct and a member will use a component not on the list and it works. This is normally an exception to the rule, however.
Another good resource for upgrading the computer is the "Upgrading and Servicing Guide". This guide provides a diagram of the where the components are located and instructions on how to upgrade them.
There are numerous videos online to help you perform these upgrades. The Processor upgrade can be a bit intimidating, but if you take your time and follow instructions it can be done very safely. Upgrading a computer can be very rewarding when you see the increased performance!