I have an eMachines E527-2537 laptop which I picked up on an Amazon lightning deal, and two of my friends have identical laptops as well. The unit specifications say that a maximum of 4GB of RAM is supported, but I’ve seen some situations where those specifications weren’t accurate and higher amounts of memory can be taken. I replaced the 2GB with 8GB (2x 4GB DDR3) to see what would happen. The system recognizes the RAM, but a very odd thing happened…
Apparently, installing more than 4GB of RAM causes the processor to run at the speed of a 486!
While everything seems to function properly, it does so at an unusable speed. So, apparently an Intel Celeron 900 system doesn’t tolerate more than 4GB being installed. Even one 4GB stick works as long as the second slot isn’t populated, so it’s a capacity limit rather than a per-DIMM size limit.
Hopefully this helps someone who runs into the same weirdness!