From: Omer Zak (omerz_at_nonexisting.hamakor.org.il)
Date: Tue 31 Aug 2004 - 23:12:02 IDT
Adir Abraham wrote:
> On Tue, 31 Aug 2004, Omer Zak wrote:
>
>>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).
This was one of the important facts, which I needed to know - whether
PC-2700 can work where PC-2100 was designed to work (of course, at
PC-2100 speeds).
>>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.
Mea culpa, the booklet which I have indeed refers to U8588, not U8858.
>
>
>>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".
In addition to the fact above, the other thing which I need to be sure
of is that my motherboard would be able to recognize the PC-2700 well
enough to work with it (even if at PC-2100 speeds).
> ... 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).
I do not mind losing the extra speed of PC-2700 if it is what is
required to make it work in my motherboard. However, I would hate to
have the existing PC-2100 lose speed, as my PC would be a bit slower
than it was previously.
> ... 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).
As I said, my PC currently has 256MB memory (PC-2100 DDRAM module).
My wish is that after I buy the PC-2700 module, either it works with the
existing PC-2100, in which case I have 768MB memory; or they do not work
together but the PC-2700 works alone, in which case I have 512MB memory,
which is enough for my current needs.
Thus, if the PC-2700 cannot work with my motherboard (with or without
PC-2100), I'll lose. This is why I asked in this mailing list.
Thanks,
--- Omer
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