The newest Itanium chips are far behind in there development vs the Xeon's.
Your best bet would be to get a W3580, this runs at 3.6Ghz with a single thread.
Just an example from Spec.org:
Fujitsu Celsius M470 Specfp2006 (Xeon W3580) = 42.0 points
HP Intergrity RX2660 (Itanium2 1.66Ghz) = 20.4 points
The fp benchmarks include fortan tests.