That Biostar board, like many others, put an AGP slot onto the PCI bus. That only works with AGP cards that are backwards compatible to 3.3V signalling. Many of today's cards are not.
To add to that deceptive thing, these boards have a wrongly-keyed AGP slot fitted - which means 1.5V-capable cards fit in although you definitely need a 3.3V-capable card. That way, 1.5V-ONLY cards like Radeon 9600, 9800 and X800 cards do fit, but won't work, and may even take damage.
There are two ways of getting full-width PCIE and proper AGP onto one board: Add an AMD 8151 HT-AGP tunnel to any PCIE chipset, or go the other way round and add an ULi M1695 HT-PCIE tunnel to any AGP chipset.
ULi even offer a package, M1695 plus their previous M1689 AGP single-chip-set now relabelled as M1567 "southbridge".