@Vietnam1,
I have removed your inquiry from the older replys based on this premise:
1) The last comment was a single point. That person has not been back in several monthes.
2) You need to state your situation as it exists.
3) I have added below the original post and replies, so others may understand your inquiry.
You should understand that those old business machines are NOT candidates for a gamers delight, as the PSU in those system utilize a non-standard connection to the motherboard. It is NOT a standard ATX design.
http://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/hp-8100-elite-graphics-card/td-p...
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Custom Asus Z97D, I7-4790k, 16GB RAM, WIN10 Pro 64bit, ZOTAC GTX1080 AMP Extreme 3 fan 8GB RAM, 500GB SSD, Asus PB287 4k monitor, Rosewill Blackhawk case and 750W OCZ PSU.