4 models of GTX 1070 Ti, which is the best for overclocking ?

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I don't know anything about the inno3D card so I wont comment on that besides saying the cooler looks pretty monstrous.

Out of the other 3 how high of an overclock you can achieve will be more down to your luck in the silicon lottery rather than the quality of the rest of the card. All three have a good enough cooler and VRM to do some overclocking. The ROG strix certainly has the best VRM out of the three, so I would personally go for that assuming it isn't too much more expensive than the others.
I don't know anything about the inno3D card so I wont comment on that besides saying the cooler looks pretty monstrous.

Out of the other 3 how high of an overclock you can achieve will be more down to your luck in the silicon lottery rather than the quality of the rest of the card. All three have a good enough cooler and VRM to do some overclocking. The ROG strix certainly has the best VRM out of the three, so I would personally go for that assuming it isn't too much more expensive than the others.
 
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Because the 1070 Ti is quite a bit cheaper than a 1080, and through overclocking it can get quite close to even an overclocked 1080. As such, I have a pick to make between these 4 models, which are priced almost the same (difference in price is max 5 bucks between them)



That's basically it, all 3 are withing 5 dollars range of each other, and I'm really interested in what's not part of the lotto, the VRM, and the cooler pipeline/efficiency, don't know about the other two, but I do know that the MSI one has a 10 phase VRM and the Strix card has a 6 phase. Are you saying that Strix has higher quality VRM's ?
 
That depends on how they wired them up. A lot of them say things like 10 phase or 12 phase, but really what they have done is run pairs 'phases' of a single VRM chip. so the individual phases are basically a pair in parallel, ie, really a 5 or 6 phase part. You can bet beefier VRMs as single phases.

Usually don't delve down to that level myself. I just slap a water block on because temperature tends to beat out VRMs nearly every time. With Pascal most silicon hits a wall around 2100-2150Mhz anyway, and even reference cards with a good cooler can manage that.