Xeon w5590 bottleneck sli titans

I don't think it would bottleneck too much. The W5590 has the same arch has the first generation i7s. From the benchmarks I've seen, a first generation i7 920 overclocked to 4.2 GHz will perform roughly the same as an i7 3770K at stock speeds as far as gaming goes.

Basically, a W5590 should be relatively okay, and pretty decent performer still if you do decide to overclock it.
 

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