Funny you bring this post back up now; I FINALLY got my G10 in the mail, after more than a month and a half waiting for delivery. I'm planning on doing the install this weekend.
I've been really concerned about the VRM temps issue, particularly after finding this review of the G10 at http://www.pugetsystems.com/labs/articles/NZXT-Kraken-G10-Review-527/
From their site:
Now, as you can see with the thermal imaging focusing on the VRM chips, it appears that the chips are running at well over 100 degrees celsius (note: the bottom right corner to which I'm referring is the Titan, but it's close enough to the 780 that I'm going to use its benchmarks as if it were our 780s). At this point, I'm 50/50 on whether to purchase some kind of VRM heat sinks, and here are my thoughts on the matter;
1) My primary concern is to bring down the core temps for gaming, not necessarily to squeeze the best possible OC out of the card. After less than an hour of playing Assassin's Creed IV maxed at 1440p, the ambient temps in my well-ventilated room rose 12 degrees F, from 70 to 82. May not seem like much during the winter, but with summer coming... I'm really dreading anything that contributes to the heat.
2) The temperatures you see above are during a FurMark benchmark. As they admit on their site,
Furmark is somewhat of an unrealistic test for most users since it puts a much higher load on the video card than almost any game. However, it is a good way to put a "worst-case scenario" load level on the card so it is very useful.
This makes me believe that if you plan on using the 780 + G10 for hardcore maxed-out gaming with a heavy overclock, you'll have to provide some kind of passive VRM cooling (like a heat sink). As I'm running my right now at stock, I don't think I'd have much reason to worry about an OC further raising the VRM's temps.
Curiously enough (and I will never be able to remember where I read this), there was an obscure forum post I found about leaving the heat spreader plate on as a way of dissipating heat; obviously however you'd have to modify it to make a hole for the G10 mounting. That seems a little too intense for me... so I'll probably just end up picking up some chipset coolers from http://www.moddiy.com/categories/Heatsinks-%26-Cooling/Chipset-Cooling/
in the hopes of seeing if they can fit underneath the G10's fan.
Hope this helps... let me know if you guys have heard/read anything else that would be useful! Thanks!