This x450 comes with 515 2-tier SD SAP score. Only 15% slower than 600 in the same benchmark that we expect from 4-way Opteron 1.6 Ghz. I'm afraid AMD will need 1.8 Ghz Opteron to beat this server by more than 20%.
The proof is in the pudding but you are probably right.
But if AMD's new 130 nm copper SOI CMOS server uP in its sweet spot system size couldn't match let alone beat Intel's soon to be replaced 180 nm aluminum bulk CMOS server uP on a commercial workload like this it would be a pretty sad statement indeed.
BTW, how fast an Opteron do you need to hit 860 SD SAP?