Originally Posted by xoleras
IMHO, you all are thinking in the wrong terms. What differentiates aftermarket 780s is the ability to prevent throttling and to feed more power to the GPU - this is why the current aftermarket cards, despite being reference PCB, tend to overclock better. They are far better at throttle prevention. Also, GPU boost 2.0 is far better than GPU boost 1.0 in terms of converting available power / TDP headroom into performance and clockspeed stability - this is one behavior i've noticed going from 600 to 700 series GPUs. GPU Boost 2.0 converts power into performance/clockspeeds.
Presumably, the lightning will allow more power delivery and that translates into higher clockspeeds and no throttle, thus higher framerates. The old school way was over voltage, but it seems that all cards are limited to +37mV and that will not change. Again - the variables are different with GPU boost 2.0 Over-voltage is not one of those variables that can be tweaked - what CAN be tweaked through custom PCBs - Higher power delivery. More power phases for stability. Lower temperatures. No throttling. And FYI, the reference 780 does throttle quite incessantly when overclocked and will hit the power limit frequently. Heck, with ACX 780s you will be pegged near the 106% power limit if you over-clock the cards hard - This is not the case when a card has more breathing room in terms of power availability and lower temps. That is what the lightning will do. If you're expecting old school over-voltage ala the Fermi days, you'll probably be disappointed - I don't see that happening on any 780 card (aside from +37mV).
Yeah, I think you're right to an extent actually, I've noticed that with my ACX higher fan is affecting things clock/stability-wise, presumably by bumping the power draw down thanks to lower temps etc. Seeing great performance with a moderate fan speed and 1.162v + 1176mhz core for example even. I'd be surprised if we don't see an ArtMoney-style hack for the 780 lightning, given that we have for the 770 already, though. That said, all going from 1.162v ---> 1.2125v does for me is add a TON of heat and get me to 1202mhz 24/7 stable, instead of 1176. So I'm not sure voltage is really going to be what affects much unless you're hardmodding, right now, and using higher-end cooling than just the non-ref air coolers.
Frankly I was pretty much set to sell off my 780 ACX (with the TI bios it isn't hitting power limit at all and never throttling) and had my eyes set on high volts, but without going water/better I'd just add a ton of noise which I don't want, if I were to get much better of a 24/7 oc. And that's assuming we could even add enough volts to make it stable. Overall I'd say power phases + quality is what will result in a better OC with these cards for people, but only with water for anything appreciable.
And your note about not pushing for info that can't be given is definitely correct... let's not bleed the rock dry guys, nor make it unpleasant for people under NDA to give us small hints that they can.
It's not nice to read a million requests for detailed info when under an NDA, I know that personally
.Edited by GoldenTiger - 6/17/13 at 8:05pm