jameshanley39@yahoo.co.uk wrote:
> On 19 Jun, 23:23, Paul <nos...@needed.com> wrote:
>> jameshanle...@yahoo.co.uk wrote:
>>> On 12 Jun, 15:47, "GT" <ContactGT_remo...@hotmail.com> wrote:
>>>> <jameshanle...@yahoo.co.uk> wrote in message
>>>> news:1181657822.632654.50550@j4g2000prf.googlegrou ps.com...
>>>>> On 12 Jun, 14:14, "GT" <ContactGT_remo...@hotmail.com> wrote:
>>>>>> <jameshanle...@yahoo.co.uk> wrote in message
>>>>>> news:1181652420.577218.145210@a26g2000pre.googlegr oups.com...
>>>>>>> I know a bit about what DDR2 is.. and different notch position, not
>>>>>>> compatible with DDR.
>>>>>>> But i'm puzzled overPC2.
>>>>>>> I once suspected thatPC2was DDR2.
>>>>>>> I'm sure i've often seenPC2DDR2
>>>>>>> But I just saw some RAM in a laptop that saidPC2but also said DDR.
>>>>>> I suspect you have seen something like PC2700 and assumed it isPC2700,
>>>>>> whereas it is actually PC 2700.
>>>>> absolutely right!!
>>>>> thanks!
>>>>> I shouldn't have made that mistake. It said PC2100. DDR 266 (so
>>>>> 133Mhz).
>>>>> 133*16~=2100.
>>>>> But since it said DDR, it had to be PC. NotPC2
>>>>> I goess there is no such thing asPC2100
>>>>> I'm not up onPC2speeds.. But I know that with PC amounts, they went
>>>>> PC 66, PC 100, maybe even PC133 and PC150 (for the bus), Then they
>>>>> came up with DDR. What was the lowest speed they made DDR at ?
>>>> There is noPC2. There is PC2100, PC2700, etc. There is DDR, DDR2 and DDR3.-
>>> if there is no PC2 then what is this?
>>> google PC2 5300 DDR2, there's DDR2 PC5400 too
>>> there's PC2 4200 too
>>> and they are on ebay too.
>>> it does seem to me , - i haven't researched it thoroughly though -
>>> that when ram is specified, so, in the terminology. DDR and PC go
>>> together.
>>> But for DDR2, it can be written with PC or with PC2. Both give google
>>> results.
>>> So , with DDR2, there does appear to be a thing as PC2.. Is it the
>>> same as PC ?
>>> TIA
>> The place to chase down labeling information, is jedec.org, the standards
>> body. For example, this is a sample of a document discussing DDR2:
>>
>> http://www.jedec.org/download/search/N06-NM5.pdf
>>
>> The naming convention is PC2-wwww, as in PC2-4200, for DDR2.
>>
>> Paul-
>
> you must be an alien, how did you find that?!
> There are over a hundred documents on DDR, and it only displays 10 at
> a time and it isn't as quick as google at going from one set of 10 to
> the next(of course, google also lets you display 100 at a time), and
> they're pdfs, not html files you can go back and forth between
> quickly !!
>
> I looked for an equivalent document for DDR, but didn't find one. I
> searched for keyword "product label" in the "Document search". Since
> that expression appeared on the document that you found.
>
> according to the standards, is it the case that in terminology, DDR
> goes with PC and DDR2 with PC2 ?
>
>
> Looking at the jedec site, given that you describe it as the place to
> chase down labelling information, I figured that if I search for
> "label" i'd find lots of info related to labelling of different
> computer components. But all I found was DDR2.
> Nothing on labelling of DDR, nothing on the old 72pin EDO RAM..
> Nothing on labelling of any computer component that I could recognise.
> Except DDR2 !
>
> I thought I might find something on what i'd heard.. that in a phrase
> like "DDR 266", the 266 should not be followed by MHz. (even though
> it's a [M]hz speed - albeit an "effective speed") . I did find the
> DDR spec, but nothing on that. I wondered if a similar standard
> applied to FSB, and whether it's FSB 266 or 266 FSB.. Mhz or not. But
> I found no entry for FSB on jedec.
>
> thanks for the tip on jedec, I guess it's useful if you know how to
> make use of it!!
>

I don't use the JEDEC built-in search engine. I use this, setting the
domain to jedec.org . The search term was "ddr2 label" without quotes.

http://www.altavista.com/web/adv

Good luck finding labeling info for older tech :-) I don't expect
that will be quite as easy.

Paul