Hehe, I could tell you some storries about "technicians", but instead I'll just tell you this: As long as BIOS doesn't freak out when it sees the faster memory, it won't be a problem. You SHOULD set your memory for PC2100 speed, but it doesn't matter if that memory is PC2100, 2700, or 3200. In fact, PC2700 clocked down to PC2100 speed is more stable than PC2100. PC3200 clocked down to PC2100 speed is more stable still! You see, there is no minimum speed RAM can run at, only a maximum they tested it stable at. The slower the clock rate, the fewer errors you get. The higher quality the memory, the fewer errors you get. Faster memory has to be of higher quality in order to run faster, therefor it's more stable than the slower memory if both are used at the slower speed.
BTW, you know how many "technicians" have told me PC133 isn't backwards compatable to PC100 boards? They lied. I can honestly say they lied because they continued to repeat the myth even after they knew the truth. The deceived themselves (ie, lied to themselves) to justify their perceptions, and then repeated it to other people.
One problem occassionally comes up trying to run newer memory on older boards, which is density. That is to say, low density PC133 worked on nearly any board, while high density PC133 required newer chipsets. The same could be true of DDR memory as well, but I haven't encountered the problem with DDR motherboards yet.
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