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Input:
Question: I've got a Corsair 650W PSU and an i7 3930K with a cheap GPU right now. With the 780 will a larger PSU be required for stability (I'm thinking yes)?
Document: This GTX 780 superclocked edition is absolutely amazing. I'm upgrading from 2 Radeon 5870s and this single card blows them out of the water. Battlefield 3 runs at 60-70 fps during intense fights on ultra and 1980x1200; the lowest I've seen dropped to the 50s. My system: i7 960 @ 3.2GHz, 12GB RAM. No CPU bottlenecking experienced yet with my i7 960, will overclock when I experience any bottlenecking.
I am running this card with a Asus Sabertooth Z87 mobo, Haswell Core i7-4771 CPU, 32GB of Corsair Vengeance DDR3 1866 memory, I do not overclock the CPU or the GPU and I use stock cooling solutions.
I have had several Nvidia GPUs and this is by far the best of them all. The only stumbling block I had was with my power supply. This GPU requires a minimum of 650W PSU and 42A on the +12V rail. I thought I was good to go with my 800W PSU but found that on graphic intensive games like Crysis 3 my PSU safety circuits would trip causing my entire system to reboot.
I replaced it with a Corsair 1050 PSU with 87.5V on a single rail and all is well now.The performance of the card is superb. I am able to play Crysis 3 as well as the just released Splinter Cell Blacklist on full tilt without any apparent stress on card. I also fly X-Plane flight simulator and am able to turn up the graphics  settings quite a bit on that also and still have acceptable frame rates. All in all, Nvidia has another winner.
In the past, I've always had to be more budget oriented and had to opt to spend more money on the CPU or RAM and less on the video card and would typically look for a mid-range GPU (but always NVIDIA cause I loathe ATI/AMD's catalyst control center). This time around I was able to splurge for a high-end card. I am absolutely blown away by how beautiful my game looks.
So, I'm not terribly worried. Generally, this card is a beast. Everything I have thrown at it, it has laughed and sent in an amazing display and array of colors onto my 27&#34; screen. Is it an FPS gamer's dream? I don't know. I play RTS... and for all the laughing that some people are doing right now, games like Civilization 5 among others are just as taxing on a graphical system's resources as Crysis and others.
GPU Boost kicks in automatically as it is supposed to and GPU speed goes up to 1050mhz, depending on the workload (memory to 3005mhz). Overclocking is easy with EVGA Precision. I quickly got the gpu to 1200 and the memory to 3300 no problem at all. Could go higher. Did it in real-time with furmark running a burn-in and saw the fps go up. Anyway I didn't see any improvement (in fact it benched lower!)
VERY POWERFUL at 1080p. I upgraded from a GHz7970 and while not a huge upgrade, my confidence in adding a 2nd card has been lifted. Must have a 750w psu if you plan on OC'ing, with my CX600, FX-8350 at 4.8GHz and 780 at 1228mHz, my pc randomly restarts in games.But....Crysis 3.... OMG before, my 7970 got 55fps on average, now, with SC780, closer to 80 fps. My performance in multiplayer has skyrocketed.
Runs as smooth as Butter! Great GPU. Well worth the price difference over a comparative AMD card. Runs cool and quiet even with reference cooler!Fast and cheap shipping to Australia, safe packaging, but took a while for it to come back into stock for AUS shipping... Something about different warehouse stock not capable of shipping this way, even though it was listed on the International shipping site... Worth the wait!! !
There were no performance sacrifices required with this card.
Answer: It should be fine, but just. Im running an i52500@3.7 and my 780@1ghz with a Corsair AX750.. My system consumes around 450w at full load. You may want to try it out first and then upgrade your Psu if you need to, specially if you are going to OC. Which I assume you will. But again, it should be fine to be honest. Have you simulated your power consumption online?