D0 stepping, yes (for 3500/5500 series). In fact, the 2010 SP quad-core models both use D0 stepping CPUs from the 3500 "Bloomfield" series (W3530 and W3565).I know the 2010 Mac Pro machines support B1 stepping Xeons, but I was wondering if that was it? Would they support A0 stepping Xeons or D0 stepping Xeons as well?
As for the A0 stepping:
I had been browsing through the EVGA forums, and one of the threads had folks discussing loading an SR-2 motherboard with dual A0 stepping X5650 Xeon hex-core chips.
Oh, gotcha. Just never seen an A0 stepping in recent "release" Xeons.Too lazy to look ATM, but they're almost certainly Engineering Samples.