Minimum of a 400 Watt power supply.(Minimum recommended power supply with +12 Volt current rating of 26 Amp Amps.)An available 6 pin PCI-E power connector (hard drive power dongle to PCI-E 6 pin adapter included with card)
You have a pci-e2.0x16 slot right? Or is it just pci-e x16?
I know it's backward and forward compatible, but that's not the issue. A card meant for a 2.0 slot will be bottlenecked by a 1.0 slot.
It will be a good idea to upgrade your motherboard at some point in the future, because you won't get your money's worth out of a new card.