No only 1.4V and I got about 10% iirc. 6800 series cards can have issues with running at over voltage as the regulators tend not to be up to the job, the ultras will tend to do better as they have a higher power regulator setup installed.
I don't normally run my cards over 1.3 as the increased load on my cooling loop means I have to run the rad fan annoyingly loud.
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