When you really want to game... but the HP motherboard uses some sort of custom 6pin power connector, not the standard 24pin atx plug, so you could only use a gpu that
Problem with front panel connector for HP case | Overclock.net
657134-001 HP P6-2000 Amd Desktop Motherboard Fm1 (Refurbished)
Replacement Motherboard Brings New Lease Of Life To Classic Thinkpads | Hackaday
HP Pavilion 500-277c Motherboard diagram and other questions - HP Support Community - 4134804
How to connect an old motherboard with a 12 pins power connector? - Super User
motherboard - What is the 6-pin power connector on an HP ProDesk? - Super User
Solved: pin assignment for Power On/off Switch/led Cable 710821-001 - HP Support Community - 7458720
HP Z420 ATX modification | «WatchMySys» Blog
12 Pin Connector from a HP Bang Olufsen Envy Phoenix Desktop... - HP Support Community - 7913742
Amazon.com: Longdex 11.8-Inch 24 Pin to 18 Pin ATX PSU Power Adapter Cable for HP Z230/Z420/Z620 Motherboards : Electronics
HP Server Z440 Main Power 24 and 8 Pin to 18 and 12 Pin Adapter Cable - modDIY.com
HP DC5100 818-4 Rev0E S2A Motherboard w/4 x 1GB RAM | eBay
Will this ATX power supply work with this HP ProDesk 600 G1? : r/buildapc
What's this weird 6 pin connector called? - Power Supplies - Linus Tech Tips
motherboard - What is the 6-pin power connector on an HP ProDesk? - Super User
Motherboard Power Connectors | PC Repair and Maintenance: In-depth Look at Power Supply | InformIT
Converting HP Pre-built into decent gaming PC (PSU/MOBO Mod) - Troubleshooting - Linus Tech Tips
HP Pavilion power button/LED connection issue with new motherboards. Any solutions? I'm not an expert on how to make things work correctly in this scenario. (Expanded upon in image captions) : r/sleeperbattlestations
