Can my pc supports a igb graphic card?

i have a 2006 model compaq presario whose configuration is p-4ht 2.93ghz with 910gl chipset with 1gb ddr2 ram n agp slot.I m already using a nvidia 8600gs 512 mb graphic card n i want to upgrade my graphic card to 1gb ati radeon.I just want to know that if my pc can support this graphic card