I bet there will be mixed versions, supporting both DDR2 and DDR3, just not at the same time. Asus and Gigabyte have mobos like that based on P35. They'd be smart to do it for X38 too IMO. I hope it's possible. I read some predictions somewhere saying that DDR3 will be cheaper than DDR2 in about 2 years. If that's true it would be nice to have dual support.