| Author |
Message |
Knack
Guest
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 Posted:
Fri Nov 04, 2005 6:50 am Post subject:
Memory quality and compatibility? |
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In order to upgrade my laptop from 256MB memory to 512MB, I need to replace
both of the existing cards, as the HP Pavilion xf255 laptop can contain only
a total of two of them
I need (2) 133-MHz PC133 SDRAM SODIMMs (144-pin, 3.3V) ; 256 MB each
Shopping around I find the following statement at various web stores:
"These are standard notebook memory modules. Most notebook manufacturers now
use such standard 144-pin SDRAM memory. However, compatibility with your
particular make/model is not guaranteed."
Do PC133 cards come in various access times like the memory chips of old?
What other specs should I be cognizant of for best performance and
compatibility? |
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Paul Rubin
Guest
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| Posted:
Fri Nov 04, 2005 7:00 am Post subject:
Re: Memory quality and compatibility? |
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"Knack" <zymatik@NOSPAMyahoo.com> writes:
| Quote: | In order to upgrade my laptop from 256MB memory to 512MB, I need to replace
both of the existing cards, as the HP Pavilion xf255 laptop can contain only
a total of two of them
I need (2) 133-MHz PC133 SDRAM SODIMMs (144-pin, 3.3V) ; 256 MB each
Shopping around I find the following statement at various web stores:
"These are standard notebook memory modules. Most notebook manufacturers now
use such standard 144-pin SDRAM memory. However, compatibility with your
particular make/model is not guaranteed."
|
Try crucial.com and choose that make and model notebook. They will
guarantee compatibility.
| Quote: | Do PC133 cards come in various access times like the memory chips of old?
|
Yes, CL2, CL3, etc. |
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Barry Watzman
Guest
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| Posted:
Fri Nov 04, 2005 7:53 am Post subject:
Re: Memory quality and compatibility? |
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Aside from everything else, there can be internal architectural issues
that are a function of the chipset on the motherboard [laptop OR
desktop] and the chips on the memory module. For example, some products
(both laptop and desktop] based on the Intel BX chipset will recognize
some 256 megabyte modules but not others (or will recognize them only as
128 MB modules). The only way to be sure is to get the modules from a
vendor that guarantees compatability, or to try them. It's not that
anyone is doing anything to cause you problems, but you are buying
memory modules using chips that were designed years later than the
laptop's chipset, and that as a consequence might be incompatible in
some cases.
Knack wrote:
| Quote: | In order to upgrade my laptop from 256MB memory to 512MB, I need to replace
both of the existing cards, as the HP Pavilion xf255 laptop can contain only
a total of two of them
I need (2) 133-MHz PC133 SDRAM SODIMMs (144-pin, 3.3V) ; 256 MB each
Shopping around I find the following statement at various web stores:
"These are standard notebook memory modules. Most notebook manufacturers now
use such standard 144-pin SDRAM memory. However, compatibility with your
particular make/model is not guaranteed."
Do PC133 cards come in various access times like the memory chips of old?
What other specs should I be cognizant of for best performance and
compatibility?
|
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Knack
Guest
|
| Posted:
Fri Nov 04, 2005 8:02 am Post subject:
Re: Memory quality and compatibility? |
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|
"Paul Rubin" <http://phr.cx@NOSPAM.invalid> wrote in message
news:7x8xw58bwd.fsf@ruckus.brouhaha.com...
| Quote: | "Knack" <zymatik@NOSPAMyahoo.com> writes:
In order to upgrade my laptop from 256MB memory to 512MB, I need to
replace
both of the existing cards, as the HP Pavilion xf255 laptop can contain
only
a total of two of them
I need (2) 133-MHz PC133 SDRAM SODIMMs (144-pin, 3.3V) ; 256 MB each
Shopping around I find the following statement at various web stores:
"These are standard notebook memory modules. Most notebook manufacturers
now
use such standard 144-pin SDRAM memory. However, compatibility with your
particular make/model is not guaranteed."
Try crucial.com and choose that make and model notebook. They will
guarantee compatibility.
Do PC133 cards come in various access times like the memory chips of old?
Yes, CL2, CL3, etc.
|
I see an additional spec given for one card as being SPD CAS 3 latency. Is
that the so called "access time" in nanoseconds? If so is that the fastest
available?
That same source states that card may be any one of 19 model numbers given
(presumably made by 19 different manufacturers). |
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bxf
Guest
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| Posted:
Fri Nov 04, 2005 2:32 pm Post subject:
Re: Memory quality and compatibility? |
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Knack wrote:
| Quote: | I see an additional spec given for one card as being SPD CAS 3 latency. Is
that the so called "access time" in nanoseconds? If so is that the fastest
available?
That same source states that card may be any one of 19 model numbers given
(presumably made by 19 different manufacturers).
|
The point is that even if all the specs are correct, a given memory
module may not work with a particular machine. As suggested above, you
can't go wrong with crucial.com. Good memory, good prices, good
service, and guaranteed compatibility. |
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