From: Adir Abraham (adir_at_nonexisting.hamakor.org.il)
Date: Tue 31 Aug 2004 - 20:01:58 IDT
On Tue, 31 Aug 2004, Omer Zak wrote:
> The motherboard is of 2002 vintage (478 socket, P-4 1.7GHz) and the
> memory is a single PC-2100 256MB DDRAM module (PC-2100 is rated at 266MHz).
My not-so-wild guess is that you have a i845 chipset, or VIA-compatible
chipsets.
> I would like to know whether it is OK to use a 512MB PC-2700 (333MHz)
> module in the same system, and whether I can mix both DDRAMs (to have
> total of 768MB).
It is OK. It will do the work. Both modules will work at their lower,
agreed speed. PC2100 in this case. To be more exact, they will also
synchronize at their agreed burst times (higher burst times, ofcourse).
> The motherboard is BioSTAR MBP4F/03/R04 (or maybe it was M8P4F or U8858).
> Anyway, I found a mention of U8858 but no further data.
>
> According to the U8858 booklet, which I got with the motherboard, it can
> use PC-1600 and PC-2100 memory modules.
I just found some document about it in Biostar's archives. U8588 contains
a VIA P4X266A chipset which from its name you can guess that it supports DDRs
of up to 266MHz. That is PC2100 as you said.
> Where can I read an up-to-date introduction to those memory issues
> (PC-2100 vs. PC-2700 vs. 2-year old motherboards)?
What would you like to know? speeds are a matter of "negotiation". If two
memories talk in different speeds, the motherboard will talk with them at
the common-minimum speed of the two (i.e. PC2700 chips can speak at
PC2100 speeds, so they necessarily can, and actually must do so in order
to have the ability to talk with PC2100 chips at their speeds - but not
vice versa). However - some motherboards, are very picky regarding
choosing memories with two different speeds, especially old ones. If you
don't find any info about it in Google, it doesn't mean that it doesn't
exist. You would better put the two memory sticks and check if it works
for you, and/or if you have performance drops. I'd warmly recommend you to
buy a 256MB PC2700 memory stick instead of the PC2100 in order to get rid
of such worries (and in order to stay a bit ahead. PC3300 is becoming a
standard, and I expect that PC2700 will start to disappear in the
following year).
Regards,
Adir.
> Thanks,
> --- Omer
> My own blog is at http://www.livejournal.com/users/tddpirate/
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