On Sat, 8 Jul 2006, Gaffer wrote:
I will bet that the ram stick has chips on both sides !
That would be a high density stick. A low density would only
have chips on one side. The mainboard failing to see one side
of the ram stick is quite common !
That would be a *double sided* stick, not a *high density*
stick. A double sided memory module is more likely to be low
density rather than high density. This is because the *memory
chips* used are of a lower capacity (lower density). More chips
are needed compared to an equivalent sized memory module using
higher capacity (higher density) memory chips. IOW density is
in reference to the size (aaMb x b) of the memory *chips* that
make up the memory module.
Here's another way to look at this:
----------------------------
<http://www.ordersite.com/canadaram/terms.htm>
Density:
"When a RAM module is built, the manufacturer can design it
using high density or low density chips. For example, modules
built with 4 x 32Mb chips, 8 x 16Mb chips or 16 x 8Mb chips all
come out to the same amount of RAM. However, the memory
controller circuit in a computer must be able to address the
chips on the module - if the memory controller cannot address
higher density chips, that computer will only function with
modules built with lower density chips."
----------------------------
Here's another ram vendor's definition of density (and a
caution):
----------------------------
<http://www.pcboost.com/store/listmemory.asp?IDCategory=94>
"DO NOT PURCHASE ANY HIGH DENSITY MEMORY FROM ANYONE UNTIL YOU
PERSONALLY HAVE SEEN THE ACTUAL DOCUMENTATION SHOWING THAT YOUR
SYSTEM CAN READ 1.5GB OR MORE MAXIMUM MEMORY. DON'T TRUST
SOMEONE'S OPINION - SEE THE ACTUAL PRINTED DOCUMENTATION
SHOWING 1.5GB OR MORE MAXIMUM MEMORY CAPABILITY BEFORE YOU BUY
ANY HIGH DENSITY MEMORY FROM ANY COMPANY"
" High Density = For systems that can accept 1.5GB or more
maximum total system memory
Standard Density = For Systems that can accept up to 512MB in
any memory slot
Low Density = For systems that can accept 512MB, 768MB,
1024MB maximum total system memory"
----------------------------
It seems (my observation only):
Memory modules 1Gb and over are most likely high density
only. Memory modules 64Mb and below are most likely low density
only. That leaves the 512Mb, 256MB, and 128Mb memory modules
with the low/high density option.
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