[Beowulf] Slection from processor choices; Requesting Giudence

[amjad ali]

Hi All, first thanks to all for reponding.
After going through the reponses,  I personally feel attraction
towards opting "Two AMD Opteron Processors (each one dual-core
processor) (total 4 cores on the board) at each compute nodes".
Moreover using 2 GB of RAM at each node. Any suggestion about using
network interconnect technology?

Now i want to clear that parallel (CFD) code development how much
differs in this configuration than the configuration of single
processor on each node.

with best regards:
Amjad Ali.