laptop memory: can I use PC2700 DDR sdram SODIMM in a laptiop replacing PC2100?

Question

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 1

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 many different types, and compaq can be fussy. Hope this helps.

Answer 2

Truthfully your question depends far more on the memory and less on the notebook.
Your user manual states exactly
"Use PC2100 DDR-266 MHz or higher RAM only"
http://h20000.www2.hp.com/bc/docs/support/UCR/SupportManual/TPM_311074-002_rev1_us/TPM_311074-002_rev1_us.pdf

As the above poster mentioned, not all memory is the same, but to be even more specific. not all memory in the same speed rating or type is the same as other memory in the same speed rating and type.
There is an IC soldered to every memory chip which tells it how to function.
Some memory will auto-sense and attempt to run at the fastest available speed while other memory types attempt to run at their highest rated speed with no scaling.
Most memory however will step down at least one speed rating. This is because most mainboards which support multiple bus speeds default to the slower speed on first post till it can detect and set the speed rating.
If you have the former it will work with your existing settings, if you have the latter it may not. (your user manual gives the impression it will. The service manual lists the bus at 133mhz or 400mhz depending on CPU.)
In the end the best way to check is to try it. There is VERY little likelihood that trying memory (as long as it fits) will damage either your notebook or the memory. There is a failsafe device designed to cut voltage in the unit if the module is incompatible.
To be truthful most of us in the service industry would simply install it to see if it works.

Answer 3

If the memory is compatible it will run at the slower 2100 speed.

Answer 4

no you need to keep the speed the same

Answer 5

try it if it works then yes if not then no