The FX-9000 should be the best Vishera bins, so you need a very good FX-83xx sample to get to those Frequencies. Problem is that their default setting is soo close to the absolute limit that they're capable of, that the overclocking margin is next to 0 (Reason why they're factory overclocks. Another two examples would include AMD K6-2 550 MHz and the recalled Pentium 3 Coppermine 1.13 GHz). I think most reviewers weren't even able to get to 5 GHz on all 8 Cores, and 5 GHz is the Frequency of Turbo on a Module.
Also, due to the extremely high power consumption, you need to account for the extra cost. You need high end Motherboards that have the beefy VRMs needed to guarantee than that nuclear reactor will be reliable, and not every AM3+ Motherboard can do that. Add in a 100W higher Power Supply, too, and the cooling. A non-overclocked Core i7 4770 should be good even on a cheap-ass B85 Motherboard with a cheap Power Supply and provide equivalent performance. And chances are that you don't need a 4770 at all and could get away by with a cheaper Core i5 4670. If you want to expend on aftermarket cooling for a Haswell to overclock it, Vishera will not even touch it.
Finally, if he has some GPUs for Litecoin Mining, what does he uses as his main GPU? Back at a time, I had two Radeons 5770 with an Athlon II X4, but I managed to mine with both at the same time 24/7 by using the integrated GPU (A humble Radeon 4200 from the AMD 785G Chipset). If he is currently using the IGP as his main Video Card and the other as mining slaves, the Haswell IGP would also be a big jump.
When they launched, the price of these was RIDICULOUS. Soo much the FX-9590 received a tremendous price cut not soo long after. Now they're competitive in CPU-only price performance, but sucks on everything else. I took it as a market stunt more than anything else.
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