I am not that interested in the Extreme version because I do not overclock my computer and no point paying more for a unlocked clock multiplier when I am not going to use it. I am hoping Intel will have 3000 MHz for the normal edition as well or even more as I am targeting at least 3GHz and above.

And yes, Yorkfield will support DDR3.

Intel Core 2 Extreme QX9650

  • Extreme edition features unlocked clock multiplier
  • Frequency: 3000 MHz
  • L2-Cache: 2 × 6144 KiB
  • FSB: 1333 MT/s
  • Multiplier: 9x
  • Socket: LGA 775

Intel Core 2 Quad Q9300

  • Frequency: 2500 MHz
  • L2-Cache: 2 × 3072 KiB
  • FSB: 1333 MT/s
  • Multiplier: 7.5x
  • Socket: LGA 775

Intel Core 2 Quad Q9450

  • Frequency: 2833 MHz
  • L2-Cache: 2 × 6144 KiB
  • FSB: 1333 MT/s
  • Multiplier: 8x
  • Socket: LGA 775

Intel Core 2 Quad Q9550

  • Frequency: 2667 MHz
  • L2-Cache: 2 × 6144 KiB
  • FSB: 1333 MT/s
  • Multiplier: 8.5x
  • Socket: LGA 775

Source: List of future Intel Core 2 microprocessors