Given that you've got performance issues and a fairly limiting deployment model, I never understood why you didn't get the most absurdly overpowered machine possible. (I assume you're not, because if you were, you'd be upgrading every ~6mo or so as faster single-core machines come out)
If I were specing a machine for HN, naively, it would be a competition between a Xeon "enterprise" CPU with huge cache and memory bandwidth (interleaved up) and a gaming/desktop CPU with maxed-out single-core performance. Xeons can do single-core turboboost now, so E5-2690 which goes up to 3.8GHz is probably the best bet, but a desktop i7-3970X 4.0GHz might be an option if you don't need ECC (which also gets you slight speed improvement on memory).
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Given that you've got performance issues and a fairly limiting deployment model, I never understood why you didn't get the most absurdly overpowered machine possible. (I assume you're not, because if you were, you'd be upgrading every ~6mo or so as faster single-core machines come out)
Would the CPU really be the bottleneck for HN?
I assume it's CPU and cache/memory bandwidth.
If I were specing a machine for HN, naively, it would be a competition between a Xeon "enterprise" CPU with huge cache and memory bandwidth (interleaved up) and a gaming/desktop CPU with maxed-out single-core performance. Xeons can do single-core turboboost now, so E5-2690 which goes up to 3.8GHz is probably the best bet, but a desktop i7-3970X 4.0GHz might be an option if you don't need ECC (which also gets you slight speed improvement on memory).