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Looks like the mobo's have gone as well.
that ASUS MOBO is way too expensive, because i bet it's entry level only
I'm concerned at 6 cores being an interim measure, not the new trend. I would be annoyed to buy the 5820k then Broadwell or Skylake comes in at 8 cores minimum 6 months later.
but performance wise a fast Z97 / Core i7 47x0 processor with DDR3 memory will offer you roughly the same performance.
Games do not really require a CPU with 8-cores and given the fact that the clock frequencies on the quad-core processors can be higher, the performance in certain scenarios will even benefit the quad-cores over 6 and 8-cores. It's close though and if you plan to build an enthusiast class 8-core platform that must last you the next five years, I would recommend the X99 / Core i7 5960X. But then again, there's budget we need to take into consideration as well.