Dual channel DDR and the E7500 chipset

[Camm Maguire]

Greetings!  First of all, thanks to everyone for the very helpful
advice offered on this list.

1) Can a single CPU installed alone in a dual Xeon motherboard with
   dual channel DDR 200Mhz memory have access to the full 3.2Gb/s
   memory bandwidth?  I.e. does the chipset restrict each CPU to a
   single channel of the DDR memory, or some such?

2) Anyone know of any comparisons/have any experience in the relative
   memory bandwidth performance between a single P4 CPU motherboard
   with PC800 RAMBUS, and a dual Xeon board with only one CPU
   installed and dual channel DDR 200?

3) Certain dual boards appear to support dual channel DDR at 266 Mhz.
   Given that the Intel E7500 chipset only supplies a total memory
   bandwidth  of 3.2 Gb/s, isn't this extra memory speed wasted?

4) Any recommendations of a good dual Xeon board with dual channel DDR
   for beowulf applications using a lot of memory bandwidth?

Thanks in advance!

Take care,

-- 
Camm Maguire			     			camm at enhanced.com
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"The earth is but one country, and mankind its citizens."  --  Baha'u'llah