DDR RAM question?

I have K7n2.  I have been using 256MB PC2100(266mhz), the system run great.  I just purchased a 256MB PC2700(333mhz).  I installed and the system is very unstable.  It crashed in games.  I ran memtest, it show a lot of errors.  Both RAM are same manufacture.  Do I have to adjust something in the BIOS for the pc2700 to work?

Thanks for responding.
I tested the pc2700 by itself.  It caused the system to be very unstable.  Is there something in the BIOS i have to set in order to work?  From what i know, that i don't have to set anything.

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