AMD outsells Intel in the datacenter space

I don't agree that this is surprising. To be "dominant" in this space means more than raw performance or value. One must also dominate the details. It has taken AMD a long time to iron out a large number of these details, including drivers, firmware, chipsets and other matters, to reach real parity with Intel.

The good news is that AMD has, finally, mostly achieved that, and in some ways they are now superior. But that has taken time: far longer than it took AMD to beat Intel at benchmarks.