Re: the different between PC133 low density and PC133 high density?



june wrote:

i'm looking for some info regarding subject above.. i have an old
desktop pc Pentium III 800mhz (Intel Motherboard) that i'm going to
use as a gateway router but memory card seems to be my major problem..
not working and need to be replaced..

so i bought new 512mb but its not working, system freeze during boot
up.. so my friend suggest me to get PC133 256mb low density that
usually support backward compability with PC100/PC66 mhz..

does anyone know how to compare which is PC133 low density and which
is PC133 high density? recently i use PC100 32mb and PC100 64mb
brought em from a friend..

I'd use the memory selectors at dealers like Kingston.com and
Crucial.com because they're conservative in their recommendations
(both they said Dell Latitude and Toshiba A205 laptops couldn't use
modules bigger than 1GB each, but a 2GB module worked fine in them).
The motherboard's chipset or the computer's model number matters more
than the type of CPU.

Also you may want to buy memory that's not only rated for PC133 but
also for PC100 because it will always work in your system. I don't
think "density" is the right word to describe the PC133 memory you
need because I had a 256MB module that wasn't fully recognized by my
Intel 440BX motherboard and probably not by my Intel 810i mobo,
either. It had 16 DRAM chips on it, just like the 256MB modules that
worked perfectly with those mobos, but instead of each chip being 16M
x 8b, each chip was 32M x 4b. Apparently what matters is for the
first number to be no higher than 16M.

Another way to check the memory is by Googleing the numbers written on
the chips (you may have to try one row at a time because some of the
numbers are the date code, not the part number). If they're actual
chip manufacturer numbers, a search should return a 10-100 page PDF
technical document from Samsung (SEC) Micron, Hynix, Nanya, Winbond,
etc., and it'll be full of numbers, diagrams, and even useful
information (i.e., whether the chip is organized 16M x 8b, 32M x 8b,
etc). OTOH if they're numbers from Kingston, Corsair, Mushkin, or
another module-only maker, your search will probably turn up empty.
BTW, modules made with chips marked in full by the chip makers tend to
be the best ones because other modules are made with reject chips
(euphemistically called UTT -- UnTesTed) and tested only with PCs.
I've gotten lots of errors with such modules, even major brands.
Speaking of testing, use a good memory diagnostic, like MemTest86
ver. 3.x (www.memtest86.com).
.

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