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#11
I once swapped out an Asus M2N68-AM SE2 motherboard for an Asus M4N68T-M V2 without reinstalling Windows 7. I didn't have to activate again either. They both have the same NVIDIA nForce 630a / GeForce 7025 chip-set. The M2N68 is DDR2 and the M4N68 is DDR3. The only thing I had to do was uninstall and then install a new audio driver. The M2N68 is RealTek and the M4N68 VIA. OEM Windows 7. I was surprised that I didn't have to do a phone activation.