Since I got a AMD 6000+ with ECS Geforce 6100 motherboard combo, I want to change the motherboard due to its poor performance. I just got a ECS A780GM MB. Because it has 2600MHz FBS. However after installed I checked the system performance with 'CrystalMark'. The score is almost the same (even worst a little bit) with the old board (Geforce 6100). New board score is 101440, old board is 101757. Also CrystalMark result still show the 'system bus' is 1000MHz, not 2000MHz which 6000+ can achieve.

Could someone explain me why the new board hasn't improved? How should I do?

My system is:

Windows XP Pro
AMD Dual Core 6000+
4GB DDR2 PC6400 (4-4-4-15)
Radeon X1650 Pro

Thanks a lot.