Sun, Micro makes a good point. I like getting the last little bit out of my setups within reason because I find it challenging and fun, but you've already got the lion's share of the performance out of your card, have overcome obstacles in doing so and now have it crankin' and stable.
There's probably a little bit more there even after the apparent limit's been hit, simply by increasing the voltage wherever it starts NAN'ing out, but there's also a lot to be said for stable and points-producing too.
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