Laptop memory: can i use pc2700 ddr sdram sodimm in a laptiop replacing pc2100?

I have a hp/compaq nx9010 which currently has 256mb pc2100 ddr sdram but is slow; i also have 512mb pc2700 from a seimens/fujitsu laptop. can i replace pc2700 for pc2100??
Answer
The memory probably is not going to work on your compaq. the best way to find out is to take a trip over to http://www.18004memory.com and see what your laptop requires, and see if the other is compatible. they will tell you if the system can handle more, and what types are needed. not all ram is created equal. some is non-parity, ecc, etc. there are blokey different types, and compaq can be fussy. hope this helps.