Athlon x2 5000+ (AMD K8 with 45nm?)

[imamage]

has anyone tried this cpu with a motherboard supporting DDR3 ram, also is there a great differences between DDR2 and DDR3.

I have this cpu X2 5000 on it's own (unlockable to quad core and L3 cache), is it worth buying a new setup on this, or go for a new system that support DDR3 ram with cpu like amd am3 545 or 555 which are also unlockable with quad core and L3 cache memory.

The CPU It won't fit in with Socket AM3
I tried with Jetway HA07-COMBO (which use Socket AM2+ , but have both DDR2 / DDR3 slot )

It doesn't boot at all
It's a AM2+ based Deneb anyway