But the DDR400 cat is out of the bag. Intel, which doesn't introduce a new chipset without copious validation and qualification, is already contacting memory chip and module makers for DDR400 samples for testing. And sources inside JEDEC said discussion of a new DDR400 standard will come up at the panel's next quarterly meeting in Hawaii on December 4.

You will remember that only a few months ago Intel was bad-mouthing DDR400. Not needed because the next lowest DDR333 speed grade was quite adequate. No DDR400 JEDEC standard. Potential heat dissipation and signal integrity problems. And Intel didn't want to divert resources for the comprehensive DDR400 validation testing.

So what caused the surprising about-face?

Intel reportedly decided to next year upgrade to a quad-pumped 800-MHz processor front side bus. And suddenly a DDR400 memory at 400Mbits/sec data rate was a multiple frequency match with the 800-MHz FSB.

Also chipmakers were getting higher and higher yields of DDR400. With die shrinks to 130-nanometer (0.13-micron) processing, the higher memory speeds were much easier to achieve. And since the high speed PC main memory and server chip is a bin-out sort from final testing, the 400Mbit/sec version was a natural by-product.

Samsung officials claimed that at least one-third of its DDR production is coming in at DDR400 frequency. In fact, Samsung is having to down-sort naturally fabricated 400Mbits/sec chips to lower speed grade DDR333 and DDR266 versions because of the current lower sales volumes of DDR400.

So far DDR400 has been relegated to a niche market of white box PC builders looking to differentiate their boxes from mainstream competitors. Two third-party chipset vendors, Silicon Integrated Systems and Nvidia Corp., can support DDR400 for AMD processors, and SiS and Via Technology Inc. support Intel MPUs as well.

All that should change markedly when Intel comes out with its own DDR400 chipset next year.

This column has learned, however, that contrary to some industry reports, Intel's next generation Springdale chipset slated to debut in Q3 '03, won't be the version supporting DDR400.

The latest Intel memory roadmap quick-change is reminiscent of past switches from Rambus RDRAM and late adoption of DDR. With the DDR400 flip-flop, however, Intel appears to be leading the charge this time instead of belatedly following the trend.