I definitely think the i7-3930 cpu would be fastest, I’m just not sure if I would get close or satisfactory performance from Xeon if other benefits like EEC memory, low power consumption, reliability would make up for it. People have made me scared of “clones” but ADK for instance seem like they have alot of expertise.
I might be able to do six or eight Xeon cores but then it starts to depend on the the type of Xeon model.
My choices from Dell were:
Pretty much out of budget unless spectacular: 2 x E52687 : 3.1GHz with 20MB Cache, 8 core.
Cheapest, closest to my budget: 1 x E52687 : 3.1GHz with 20MB Cache, 8 core.
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Getting out of budget: Dual 6-core: $6500. 2 x E52667: 2.9Ghz, 15MB.
Haven’t looked into i7’s as much except on ADK’s website, can put some of that money into other areas but stability and reliability is important as well.