Paul over at ClubOC has taken a look at some DDR-400 memory from Kingmax. In their email they said they had been waiting for several weeks to release their review and it still turned out the sample which they tested with used hand-picked DDR-333 chips. After my tour of Kingpak and Kingmax earlier this month, I believe the sample ClubOC tested still won't be the final release - Don't let these results influence you too much, as far as I understand the real DDR-400 from Kingmax is still on its way.
Again, talking to Kingmax, I was told that their DDR400 modules are handpicked DDR333 sticks tested to run at DDR400. This seems a little shady to me. I was also told that the 266 chipsets have a little more "compliant" than the current DDR333/400 chipsets and I would probably have more success running this stick using an older 266 chipset. All of this doesn't really matter. If I pay my money for something that says it will run at 200MHz, it better run at 200MHz. This one does not. Just out of curiosity and to make sure I wasn't screwing up, I searched for reviews on Kingmax DDR400. I didn't find many, but every single one that I found couldn't get it to run at 200MHz. I believe I was the only one that could even get a benchmark at 200MHz. I'm going to leave you with one last quote from Kingmax, "when you want to speed on the highway, at least do it in a Ferrari".More information at ClubOC.