Several owners of Asus 1005PE netbooks are running into a problem.  It turns out that upgrading the memory from 1GB to 2GB isn’t as easy as it seems.  Many people were upgrading to a single 2GB stick of PC2 6400 to make it easier for the netbook to run in Super Performance mode.

After installing the 2GB memory chip the users discovered issues with the computer booting into Windows or spontaneously losing the ability.

One of the few things which is known at this point is that the PC2 6400 2GB SODIMM from Crucial does not work.  Crucial may not want to cop to the fact that it doesn’t work or be working on a fix but in the meantime you should just stay the heck away from it.  The part number of the memory which currently does not work is CT25664AC800.

While there isn’t a definite list of what works and what doesn’t people are having luck using CGM2X2GS800 from Corsair.  This memory sells for about $55 but it’s guaranteed to just pop in and work.

A word of caution for people who end up doing the upgrade.  Make sure to go into the BIOS and turn off the quick boot option.  Then install the memory and turn the computer back off.  From there you should be able to turn the feature back on and not have any issues from there.

After doing some research it looks like the issue may have to do with the timing of the memory.  It boils down to the CAS Latency or CL of the memory.  The memory the 1005PE like needs to be CL5 in order for it to work.

[Sources: EeeUser Forum - here, here, and here, Wikipedia]

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