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Tech Helproom


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RAM Upgrade Failure


Felidae Ryl

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Hi everyone. I just bought my 4/5-year-old Lenovo 3000 N200 (XP 32-bit) a ram upgrade - it had 2 1GB sticks of DDR2 so I bought two 2GB sticks. When I start the laptop, it stays stuck on its manufacturer logo splash screen.

I guess it might need a BIOS update? Or the laptop's just not equipped to handle that much RAM, despite what the manufacturer's specs say (which would be the first time I've had that happen). I've never had this sort of problem with ram, if anything the POST beeps and I re-seat a not-quite-in stick and that solves it.

The only difference between the old and new sticks, apart from being 1 or 2 GB, is that the old ones say "128M 64" and the new ones are "256m 64". I don't really know what that is or if it would cause this problem.

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Ian in Northampton

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It would certainly be counter-intuitive, if the system has two slots, and each slot can take a 2GB card, that total memory would be limited to 2GB.

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Felidae Ryl

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I have tried with one old stick and one new together, still no dice. I read the Lenovo guide which said it can take 4GBs.

I bought them from Amazon and they seem to do a no-quibble return, so that's my solution!

Thanks for all the responses. As it happens, I didn't make much sense out of the 32/64-bit paragraph in the first reply either, except to assume it was to remind me that there is a difference. I didn't like to look too ignorant so skated over it :p

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Fruit Bat /\0/\

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PAE is a method to access memory above 4 GB; this method has been widely implemented.

PAE maps up to 64 GB of physical memory into a 32-bit (4 GB) virtual address space using either 4-KB or 2-MB pages.

The Page directories and the page tables are extended to 8 byte formats, allowing the extension of the base addresses of page tables and page frames to 24 bits (from 20 bits).

This is where the extra four bits are introduced to complete the 36-bit physical address.

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KRONOS the First

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I glad that has been clarified.

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Fruit Bat /\0/\

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:0)

Simply

Older versions of Windows 32bit systems without PAE support will not access (or even see) more than 3.5G of RAM

XP sp2 onwards should have PAE support - if the systems are fully updated.

Similarly older versions of Windows could not see hard drives larger than 127G again addressed by an update in XP SP2.

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lotvic

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Did you get the right sort: Unbuffered NON-ECC ram

Link to Crucial choices compatible with your Levano

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lotvic

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ooops - Lenovo 3000 N200 :)

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Felidae Ryl

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I didn't check whether it was unbuffered non-ecc since every time I've bought ram in the past it has been, and the specs for these sticks don't stretch to that info. Thanks for the link to Crucial. Once I've been refunded for this ram, I'll see if I want to risk trying again.

Thanks for all the explanations of the PAE stuff too. I thought XP could only see 3.5 GBs anyway. I am running SP3.

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