If you don't need 12Gb of vram, the 980 TI is a better option for gaming (and much cheaper).

I have one ASUS 4k 60Hz monitor. Would 12GB of ram be more appropriate or 6GB of ram for 4k 60Hz monitor?

vincinator44
If you don't need 12Gb of vram, the 980 TI is a better option for gaming (and much cheaper).

Cost-to-performance wise, obviously the 980Ti is the clear choice. But if you require >6GB VRAM, or are simply willing to spend the additional money for a few extra fps, then the Titan X is the card to choose.

dextor1259
I have one ASUS 4k 60Hz monitor. Would 12GB of ram be more appropriate or 6GB of ram for 4k 60Hz monitor?

How much VRAM is actually necessary has been debated in several threads over the past couple of months. For the vast majority of currently available games you will not require >6GB of VRAM for 4K. But there are a handful of titles that come relatively close to 6GB (as shown in benchmarks) and a couple that surpass it. So I would say it depends how long you want to keep the Titan X/980Ti. If you're going to upgrade when Pascal is released in Q2 2016 then you may as well save the money by buying the 980Ti instead. But if you want to keep the card you choose until late 2016/early 2017, I personally believe an increasing number of titles are going to surpass that 6GB threshold and therefore the 12GB will be useful. DX12 WILL inevitably be mentioned by someone but it will not help previously released games and it will only be supported by the AAA developers in 2015/2016, so VRAM stacking (if you were to consider SLI 980Tis in the future) isn't a magical solution for VRAM.
 

dextor1259
My Titan X does run really hot unless I set the fan profile to aggresive mode.

 
You could consider a Hybrid cooler for it, in which case the voltage would be the limiting factor rather than the temperature and you could push the card as far as it'll go. The additional temperature is mainly due to the Titan X's 24 SMX clusters instead of the 980Tis 22.

jsarver101
From what I've read the whole asic = better chip really isn't all that true. Correct me if I'm wrong.

So...many...arguments :p. I've read quite a few heated discussions concerning ASIC and I believe it does indicate lower voltage requirements and therefore probably is a measure of overclocking potential, but I'm not an electronic engineer ;).

I checked last night, not really sure what all of it means but my 980 ti sc  ASIC is 75%

Yeah the ASIC... From my personal experience I can agree that a higher ASIC is better for OC. Currently I'm using an G1 Gaming 980 with a low ASIC of 66 and this card overclocks like ****. Can't get 1500 core stable no matter how much volt (through bios mod up to 1275 mV). Bevor i bought the card I read a lot in different forum about the cards and just everyone got the card over 1500 core. Most of them with just a bit of additional voltage, and when you ask them about there asic's they are all over 70 close to 80. So yes it does matter how high your asic is, in case of the voltage limit we have.

My 980 Ti asic is 64%. I have it running stable at 1400/7800 +30mv. Stock fan profile. Heat seems to be the limiting factor. I'm going to put a Kraken G10 on it and see what happens.

Some anecdotes now that I have two cards. I have a very tight microATX setup so the cards are right next to each other.
 
06G-P4-4990-KR (in top slot, intake fan blocked by lower card): 62% asic score. Default voltage is 25mv higher. At 1400 boost/3758 memory, 1.218v, 75 °C, it is volt limited. 
06G-P4-4992-KR (in lower slot, intake fan not blocked): 68% asic score. At 1400 boost/3758 memory, 1.187v, 72 °C, it is limited by the other card.
 
If I put the 4992 in the other slot the temperature delta swings the other way by 12 °C. From this I conclude that the 4990 is the better card since it runs 6-7 °C cooler, even though it has a lower asic score and uses more power. I may try increasing the voltage further.

63.5 % here on a reference SC 

See other ASIC thread.

77% for my Ti :)

My ti's both have asic 70% scores but i can only add 90 mhz to ram and gpu other wise witch 3 will crash while playing in 4k ultra :( temps don't go beyond 70c.

Mine from step up got 73% and i am pretty happy with it seeing this is the first time a got one over 70%.
 
Currently running it with core +210 core and +300 mem with stock voltage. Could probably go higher of course but this will do just fine for now. 

Both of my gtx 980 Ti have ASIC Quality of around 70%. I have not had enough time to overclock them to see their overclocking potential.