Remember that boost clock, temperature and tdp are all hugely important factors on the Kepler architecture. It's by far easier to overclock Kepler by un-linking (as mentioned above already) and then tweaking each card individually.
Are you getting any BSODs or driver failure only?
I'll have to try overclocking them individually. That's just a new concept for me. I'll be interested to test this.
I'm getting driver failures and game crashes only.
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