Motherboard model M7TDB use Intel 845 Chipset.According to Intel 845 Chipset specification, It only supports AGP 4X graphic card with 1.5V operating voltage. That mean, Intel 845 chipset's motherboard will not support AGP 2X graphic cards which Is required 3.3V as operating voltage.
You can easily access our extensive FAQ section, which is designed to swiftly address common queries and promptly resolve any issues you might encounter.