Real world comparison for more cores vs more clock speed

Let's say we have an server with dual hex core 1.9 GHz CPUs (24 threads) that runs 50 virtual machines with an average load of 2-4.

Would this server run better or worse or equal if it has single hex core 3.2 GHz CPU (12 threads) that has the same CPU benchmark score (cpubenchmark.net) as dual hex core CPUs?

Real world CPUs:

Dual Hex Core: http://cpubenchmark.net/cpu.php?cpu=Intel+Xeon+E5-2420+@+1.90GHz&id=1213&cpuCount=2

Single Hex Core: http://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+E5-1650+@+3.20GHz&id=1211

Adding another argument:

If the load of the first server was 13, would it be still fine on the second 12 threaded CPU?