We are trying to decide between the AMD Opteron 8356 quad and the Intel
Xeon 7350 quad based Suns.

Its hard to find head to head benchmarks in every category, but my sense
is that Intel is faster on integer workloads, and the AMD is faster on
floating point or large memory workloads.

Does anyone have more to say on this?

Actually we are looking at the x4600 if we go AMD, Sun doesn't seem to
have an 8 quad Intel box. Any issues to worry about on the 4600?