SDRAM Memory: different speed, is it OK?

I just bought a 512MB Kingston PC2700 DDR SDRAM for my IBM laptop T40, from Bestbuy onsale for $49.

From Everest Home Edition screenshot, it turns out that the original installed memory is Hyundai PC2100 DDR SDRAM.

What do you expert think about this, is it OK? I don’t really understand what the meanings of 2.5-3-3-6@133Mhz etc thingy. Any advise?

If it’s stable dont worry, PC2700 is backwards compatible with PC2100.

looks fine, the new memory is running underclocked to match the old


wait states, lower is faster

brain surgery/rocket science

If I replace the old memory with another PC2700, will I gain an increase of performance?

Does it means my new memory (2.5-3-3-7) is slower?
Thanks for all your replies

Thanks. How do I know if they are stable? Sorry if its covered before.

Random reboots and blue screens.

  1. not enought to matter
  2. no the new memory is faster, it’s running underclocked to match the old