[Beowulf] Which is better: 32x2 or 64x1

[hpc at gurban.org]

Hi,

I'm going to build a beowulf linux cluster for my
coledge. Thay want 64 core cluster with Opteron
processors.
Now I want to know which is better (performance & price)?
  * 64 x Opteron Single Core
  * 32 x Opteron Dual Core

cheers

--
Gurban M. Tewekgeli