Intel or AMD?

[Slimebeast]

http://www.gigabyte.co.nz/Support/Motherboard/CPUSupport_List.aspx?ProductID=2874

Socket AM3

Motherboard	Model	GA-MA770-DS3(rev. 2.0)
PCB	2.0
Vendor	Model	Frequency	L2 Cache	L3 Cache	Core Name	Process	Stepping	Wattage	System Bus(MT/s)	5200
AMD	Phenom II X6 1090T	3200MHz	512KBx6	6MB	Thuban	45nm	E0	125W	4000	FDD
AMD	Phenom II X6 1055T	2800MHz	512KBx6	6MB	Thuban	45nm	E0	125W	4000	FDD
AMD	Phenom II X6 1055T	2800MHz	512KBx6	6MB	Thuban	45nm	E0	95W	4000	FDD
AMD	Phenom II X6 1035T	2600MHz	512KBx6	6MB	Thuban	45nm	E0	95W	4000	FDD
AMD	Phenom II X4 965	3400MHz	512KBx4	6MB	Deneb	45nm	C3	125W	4000	-
AMD	Phenom II X4 965	3400MHz	512KBx4	6MB	Deneb	45nm	C2	140W	4000	-
AMD	Phenom II X4 955	3200MHz	512KBx4	6MB	Deneb	45nm	C3	125W	4000	FDD
AMD	Phenom II X4 955	3200MHz	512KBx4	6MB	Deneb	45nm	C2	125W	4000	FB
AMD	Phenom II X4 945	3000MHz	512KBx4	6MB	Deneb	45nm	C3	95W	4000	FDD
AMD	Phenom II X4 945	3000MHz	512KBx4	6MB	Deneb	45nm	C2	125W	4000	FB
AMD	Phenom II X4 945	3000MHz	512KBx4	6MB	Deneb	45nm	C2	95W	4000	FDD

That's how the list looks under the AM3 column. So these would work with my AM2+ mobo? (GA-MA770-DS3(rev. 2.0)). Except the ones in green.

But, how much would the performance be constrained? Cos of bus speed and stuff. With DDR2 RAM in the system.