Determine RAM specifications?

[Craig White]

On Wed, 2007-02-14 at 17:28 -0700, Alan Dayley wrote:
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> Craig White wrote:
> > On Wed, 2007-02-14 at 16:49 -0700, Alan Dayley wrote:
> >>
> >> The speed issue is important in my case because the dual channel support
> >> will only be possible if both sockets are populated with the same
> >> capacity and speed memory modules.  I want to buy a module that matches
> >> the one already installed.  The manufacturer specs show two possible
> >> speeds for this model.  I guess I'll have to open it up to physically
> >> inspect for the speed.
> >>
> > ----
> > It occurs to me that the above post suggests that there is only 1 chip
> > installed and you want to pair it with another which is probably a bad
> > idea for DDR interleave. You always want to buy them as a pair from the
> > same stock/manufacturer and if necessary, put an unpaired DIMM in a bank
> > that doesn't have an interleave which of course, defeats interleave
> > benefits - thus, you may wish to remove the existing RAM if it is a
> > single DIMM.
> > 
> > Craig
> 
> The product specification from the manufacturer website states:
> 
> Memory
>    • Configured with 512MB DDR2 SDRAM (both memory slots may be
>        occupied)
>    • 256MB(min)/4096MB (max), 2 memory slots using 256MB, 512MB,
>        1024MB or 2048MB PC4200 533MHz or PC5300 677MHz DDR2
>        SDRAM, dual-channel support requires two memory modules of
>        same capacity and clockspeed
> 
> What I hear you say is that if the two memory modules are of the same
> size and speed but are from two different manufacturers they will not
> support dual-channel.  Is that what you are saying?
> 
> I apparently have a single 512MB module already installed.  I wanted to
> double the RAM with a matching speed module to have more space and
> dual-channel speed.  But, I also wanted to buy just one module if possible.
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can be problematic - might work, might not

Craig