I hope you find your Support Forum experience a positive one! It is a great place to find the help you need, from other users, HP experts, and other support personnel. I understand that you are looking for help with a graphics card upgrade. I am happy to help with this.
From that the PCIe version is lower on the board, and the power supply is below the minimum recommended. Even if the hard drive were replaced with one that has a higher output, the difference in PCIe versions would result in a performance hit of some kind. Also note that any power supply would need to have whatever supplementary power connectors a card requires to function properly.
I hope that helps, and if it does explain the issue sufficiently please mark this post as a solution. Kudos would also be appreciated.
Malygris1 I work on behalf of HP Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution. Click Kudos Thumbs Up on the right to say “Thanks” for helping!