If you lowered the RAM down to take it out of the equation and ran that high of a vCore to it and it still wouldn;t boot, it's the chip. It's gotta be.
If you haven't, lower RAM down, and relax timings, then see what the CPU will do. That isolates the RAM out so it won't affect the CPU OC. After that, if it will OC, start raising the RAM into it, then tighten the timings to find the sweet spot. You may have to back off BClk a little too since when you bring the RAM back in it might not run at the max clocks it did with the RAM totally out of the Equation, since the BClk affects both the CPU and RAM clocks.
Check PSU voltages also with a Multimeter and make sure they are stable and don;t droop under load or fluctuate. That can raise havok with OC's. If you can also check voltages at the board. I didn't see what board you have, but on the Rampage II Extreme you can do this. Others, you have to know where to put the probes.
It is luck of the draw with some of these. Not every chip will OC the same...even in the same batch numbers. It depends on where the chip came from on the wafer, how it was binned, the date it was manufactured, and lots of other stuff.
I would check those things above though.
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