A:Answer Increasing the speed on this computer can not be done externally.
The motherboard on this computer would allow you to upgrade to an Intel Core i7-9700 3 GHz Base frequency, 4.7 GHz with Intel Turbo Boost Technology, 12 MB cache, Octa-core (Coffee Lake-R) and give you about 9% better performance.
Memory can be upgraded to 32GB.
Here is a link to the upgrading and service guide:
http://h10032.www1.hp.com/ctg/Manual/c06425327