[rescue] PC100/133 memory size/density/etc question(s)

Sridhar Ayengar ploopster at gmail.com
Wed Oct 28 13:07:49 CDT 2009

Curtis H. Wilbar Jr. wrote:
> I'm playing around with an old Asus K7M (Athlon) motherboard (with a 
> 750MHz Slot-A
> Athlon processor on it)....
> I have various memory modules... and I've found the K7M will run modules 
> most PC100/133
> boards won't (i.e. registered ECC modules).
> I have 128, 256, 512, and 1G registered ECC modules....
> All work... but the 512 and 1G modules only see half of each stick... 
> unsure if it is
> seeing the 1st half of each chip, or only half the chips.
> This board was only rated at 768M (3 x 256M DIMMs) from ASUS.
> using 3 1G DIMMs, the system sees 1.5G of memory... pushing the platform 
> to double
> what Asus intended....
> Now, the 256 and 512M modules are both double sided using 18 memory 
> chips.  The 1G
> DIMMs are double sided using 18 or 36 memory chips.
> I'm wondering if there are some different density modules that would 
> allow me to
> run 3 x 512M DIMMs and see them as 3 x 512M DIMMS... vs wasting half of 
> my DIMMs
> to inaccessibility ?
> Any ideas if there were 'low density' 512M PC133 DIMMs as well as 'high 
> density' ?
> Too bad there wasn't a way to get the K7M to see all 3G of RAM >:)

You need to use single-rank DIMMs.  I suspect that if you could find 1GB 
single-rank DIMM, and if such a thing indeed exists, you might be able 
to run 3GB.

Peace...  Sridhar

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