one the synthentical test, YES!!!Interestingly, the E3-1225v3 used in the E3 Leveno that you linked to above looks as though it has pretty nearly the same performance as the dual L5630:
PassMark - Intel Xeon E3-1225 v3 @ 3.20GHz - Price performance comparison
but speaking on baremetal, dual L5630 better than single e3... -> more cores!! and bigger RAM memory supported
AGAIn, e3 is ideal for non heavy baremetal when idle situation is mixed roughtly 40%-50%.
this your decision, spending abit $ at front and save later in 6 years, or just being cheap to get less $ without saving $ in 6 years.
I pick the first one for 24/7,
the other solution is pickig lGA1356 sandy bridge era, which way better than lga1366... processor is not $$ compared with lga1366.