no it wont matter if all things are equal.
 
having the 3rd plug allows EVGA to open up the power limit beyond 375W. nothing more. the increased power limit itself might give you better OC potential, but whether that power comes from 2 or 3 plugs is totally irrelevant.
 
EVGA is bound to the spec of the connectors. a single 8-pin plug is rated for 150W (2x8-pin = 300W + 75W slot power), which is based on the lowest end config (small wire gauge) for the spec of the connector. even though it's safe in most systems to go higher, since most PSUs are built with larger than spec wire gauge, EVGA can't allow more power on the offchance someone with a "spec" PSU tries to use the card.
 
theres more difference in the FTW3 and XC3 models than just the number of connectors. the FTW3 has a different, larger, more custom PCB with presumably better power delivery. and also presumably better silicon that should clock higher.

It will be much easier to get a bios up to 525w with a 3x8-pin card.  With 2x8-pin you're stuck at 375w unless you go XOC bios or shunt mod.

I know the extra connector will allow for more power, I just wonder if there are diminishing returns above 375w. Like how much more clock speed does that extra 150w get you? Better PCB and better power delivery could be a factor but how much? An extra $300 on top of an already pricey card is a lot. If it's $300 for like 45-60Mhz that wouldn't be worth it. It would be an easy choice if the FTW3 was only $100 more like on the 3080 FTW3, but EVGA has decided to charge a lot more for the same cooler/PCB on the 3090 FTW3 for no reason that I can see other than 3090 cost more so let's just charge even more.

Yes, indirectly - the cards with three power plugs have higher watt draw VBIOS'. Higher wattage 30 series cards can clock higher.

The performance % increase isn't as high as previous generations since Nvidia set this series' boost clocks to be even more aggressive.

For the 3090, a stock 2 plug card gets about 12 FPS less than an overclocked 3 plug card at 4K across a suite of tests. I used the 3090 Strix OC review from techpowerup for that # - https://www.techpowerup.c...-3090-strix-oc/28.html and the Zotac Tinity as the base card from the same reviewer since the test suite was the same - https://www.techpowerup.c...x-3090-trinity/28.html

arestavo
Yes, indirectly - the cards with three power plugs have higher watt draw VBIOS'. Higher wattage 30 series cards can clock higher.

The performance % increase isn't as high as previous generations since Nvidia set this series' boost clocks to be even more aggressive.

For the 3090, a stock 2 plug card gets about 12 FPS less than an overclocked 3 plug card at 4K across a suite of tests. I used the 3090 Strix OC review from techpowerup for that # - https://www.techpowerup.c...-3090-strix-oc/28.html and the Zotac Tinity as the base card from the same reviewer since the test suite was the same - https://www.techpowerup.c...x-3090-trinity/28.html

Thanks for the links. So it does look like there is a nice increase.

The limit is hard for 2x8-pin cards since they can max out the power limit out of the box.

It helps at bit if you can utilize the extra power. ;)