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
24-Pin to 6-Pin Power Supply Adapter Cable for HP EliteDesk 800 G2 Not G1 @US | eBay
Amazon.com: YEZriler 24 Pin to 6 Pin ATX Power Adapter Sleeved Cable for HP Z200 Z230 4300 6080 8080 ProDesk 600 G1 G2 EliteDesk 800 G1 G2 13-inch(33cm) : Electronics
New 12″ ATX Main 24-Pin to 6-Pin PSU Power Adapter Cable 18AWG for HP Z220/Z230 » eSquareParts
24-Pin to 6-Pin Power Supply Adapter Cable for HP EliteDesk 800 G2 Not G1 @US » Labex Electrolarynxes
Sanoxy 11.8in 24p To 6p Power Supply Adapter Cable Compatible With Hp Elite 8100 8200 8300 800g1 : Target
ATX Main 24-Pin to 6-Pin PSU Power Adapter Cable 18AWG for HP Z220 Z230 Z340 | eBay
ATX PSU Power Supply Cable PCIe 6 Pin to ATX 24 Pin Power Supply Cable 24P to 6P for HP 600 G1 600G1 800G1 Mainboard - Walmart.com
US$ 8.90 - COMeap 24 Pin to 6 Pin PCI-E ATX Main Power Adapter Cable for HP EliteDesk 800 G1 TWR MT Series 4000 6000 8000 12.5-inch(32cm) - m.comeap.com
HP Elite 8000 8100 8200 8300 800G1 ATX 24 Pin to 6 Pin Adapter Cable - MODDIY
12" ATX Main 24-Pin to 6-Pin PSU Power Adapter Cable 18AWG for Select HP Systems | eBay
12" ATX Main 24-Pin to 6-Pin PSU Power Adapter Cable 18AWG HP EliteDesk 800 G1 | eBay
24Pin ATX Cable To 2-Port 6Pin Connector Motherboard Power Supply Adapter Cord for HP Elite 8100 8200 8300 800G1 30CM 18AWG
US$ 8.90 - COMeap 24 Pin to 6 Pin PCI-E ATX Main Power Adapter Cable for HP EliteDesk 800 G1 TWR MT Series 4000 6000 8000 12.5-inch(32cm) - m.comeap.com
ATX 24 Pin To 6 PIN PCI E Dual Psu Adapter For HP Elite 8100/8200/83300/800G1 Mainboard From Ssupplier, $3.09 | DHgate.Com
12" (12 Inch) ATX Main 24-Pin to 6-Pin PCI-E PSU Power Adapter Cable 1 – Ayagroup.com
24 Pin to 6 Pin PCI ATX Main Power Supply Modify | DIY - YouTube
24-Pin to 6-Pin Power Supply 12" Adapter Cable for HP Elite 8100 8200 8300 | eBay
ATX 24-Pin to 6-Pin PCI-E PSU Power Adapter for HP Elite 8100 8200 8300 | eBay
Amazon.com: YEZriler 24 Pin to 6 Pin ATX Power Adapter Sleeved Cable for HP Z200 Z230 4300 6080 8080 ProDesk 600 G1 G2 EliteDesk 800 G1 G2 13-inch(33cm) : Electronics
Amazon.com: 12" ATX Main 24-Pin to 6-Pin PSU Power Adapter Cable 18AWG for HP EliteDesk 800 G1 : Electronics
Aya 12-inch Atx 24-pin To 6-pin Pci-e Psu Power Adapter 18awg Aya-24pf-6pm- hp Q1H7 - Walmart.com
