From what I understand, this version of the connector is "safer". The card also uses quite a lot less power than 4090/5090 that were burning. I would also expect the failure rate to be quite low overall, but I do not want a friend's house to burn for being the unlucky 1%...
Can 5070Ti with 12V-2X6 be considered "safe"? Are there cards with additional safety measures I could look into?
I would argue that ~250W is where the safe land ends for this connector, that's the napkin math upper threshold for a worst case scenario where only 2 wires can take most of the amperage and still stay close to max spec. Anything above that will introduce a slooowly increasing risk, culminating at whatever failure rate there is with 4090/5090 cards (still low, but not low enough considering the evidence in this thread).
That being said, I think your friend will be safe with a 5070 Ti as long as you take the most common precautions - good quality PSU with good quality cables (don't use an adapter, buy 12V-2x6 cable from PSU manufacturer if you have to) , proper insertion of the 12V-2x6 connector in a position where no strong bending is applied (at sharp angle). In other words make sure the card has ample room in the case of your friend's choice. Don't cut corners, Nvidia did that already for us
It would also be a great idea to limit the card power a little, lower it by 10-15% or
better yet choose a card with dual bios and enable the "silent" one which usually does that in a more reliable manner.
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