I was wondering if this card
https://www.amazon.ca/Gigabyte-Radeon-Gaming-Graphic-GV-RX570GAMING-4GD/dp/B06Y3RT952/ref=sr_1_4?ie=UTF8&qid=1539970146&sr=8-4&keywords=AMD+RX570&dpID=41zI73OXF%252BL&preST=_SX300_QL70_&dpSrc=srch
Would work with a pre built HP pavilion P6 system.
https://www.amazon.ca/Gigabyte-Radeon-Gaming-Graphic-GV-RX570GAMING-4GD/dp/B06Y3RT952/ref=sr_1_4?ie=UTF8&qid=1539970146&sr=8-4&keywords=AMD+RX570&dpID=41zI73OXF%252BL&preST=_SX300_QL70_&dpSrc=srch
Would work with a pre built HP pavilion P6 system.