I didn't mention that, because it's not worth mentioning. It's a 2-4% difference between them, on a rough estimate. On 1,900W, that's a whopping 38-76W difference between Gold, Platinum and Titanium. Also, it's not just the % difference you have to account for. If it were, then 92% Gold efficiency on 230V, at 1,900W, would be 1,748W. No where near 1,400W. Like I said, there was a nice write up on it, using calculations based on actual usage readings, but as usual, KnC is a bag of dicks.

And yes, 220/240V is also slightly more efficient. That's one of the bonus reasons I wired mine for 240V. I get the same rating with Gold on 240V, that I would with Platinum on 120V, without having to pay the premium for a Platinum PSU. Platinum will likely never pay for the little extra 2% efficiency in the miners lifetime, let alone the uber premium Titanium. In other words, Titaniums would save me about $79 a year on a Neptune, but cost nearly $500 more. That would pay for itself in oh....only 6+ years, lol.