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.googlegr oups.com...
>
> >>> On 12 Jun, 14:14, "GT" <ContactGT_remo...@hotmail.com> wrote:
> >>>> <jameshanle...@yahoo.co.uk> wrote in message
> >>>>news:1181652420.577218.145210@a26g2000pre.goog legroups.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!!