If his PC is designed for PC2700 RAM i.e. the bus is running at 333 Mhz, the PC2100 RAM will not work. If the bus is running at 266 Mhz the PC2100 RAM will work. You could change the bus speed from 333 Mhz to 266 Mhz to get the memory to work, but that would also slow down the processor.

CharlesBlackstone wrote:
>
> Hi, I want to give my friend's son a gig of ram I took out of my Dell
> Lattitude D800 laptop, for his Dell Inspiron 8600. He currently only
> has half a gig. His machine takes newer PC2700 ram whereas mine is
> PC2100 ram. How much will PC2100 ram slow his machine?
>
> Thanks much...

--
Mike Walsh
West Palm Beach, Florida, U.S.A.