Darg, what you're experiencing there sounds like your agp card is not getting enough juice despite having the Antec 550. Freezing with the last sound repeating and rebooting when gaming were exactly the symptoms I would get if I used my old 6600gt with an underpowered psu. Those agp cards are power hungry beasts unlike the equivilent pci-e model.
I picked up a brand new xpertvision 7600gt pci-e for less than £90 from a competitor and have no issues with it. Even came with a bundled game (Spellforce 2).
I'm running 24/7 at 290fsb and 109pci-e. Last time I ran memtest it went over 1000% with no errors at all before I stopped it.
I picked up a brand new xpertvision 7600gt pci-e for less than £90 from a competitor and have no issues with it. Even came with a bundled game (Spellforce 2).
I'm running 24/7 at 290fsb and 109pci-e. Last time I ran memtest it went over 1000% with no errors at all before I stopped it.