Determine RAM specifications?

[Alan Dayley]

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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.

Alan
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