Intel is good, but amd is catching up especially with the 16 core processors, 6000+ series.
Quote we have a few opteron based server and until now they worked very nicely, The only downside is the giver energy consumption but usually its compensated by higher density as with 8-16 core you can house more user, Intel is stil begin cheep on cpu core count, Surely intel do offer (if i down remember wrong) a 20 core processor but that cost a pile of cash to buy.