According to an Electronic News Online article (“DDR thrown an Apple“) Apple may implement the new faster RAM technology in future Macintosh models:

Oct 15, 1999 — Just as Advanced Memory International Inc. (AMI2) endorsed Advanced Micro Devices (AMD) for its double data rate (DDR) DRAM chipset this week, sources say Apple Computer Corp. has rubber stamped its own plans to implement the next generation DRAM technology into future Apple computers. Apple is not expected to detail its plans until the first half of next year.