I would be careful. While according to this, the board should accept the card, your power supply might not. Modern graphic cards need up to 2 extra power supply cables, which your old PSU might not have. And also, a friend of mine had an HP PC once. Tried to install one of my old graphic cards in it, and while the board itself had the proper slot, it did not fit into the case. It seems they intentionally build their systems in a way to prevent upgrades and to force your to buy an entirely new system.