Conclusion:
The message I want to deliver is that reviews in google are a mis representation. A percentage performance scale is not how you judge a gpu. a 980 is not 15% faster than a 970. The correct representation is, 980 is 15fps better than a 970. This is especially true when there are scenes that's really pushing the cards. When 970 is rendering at an unplayble 15fps. The 980 can render at 30fps. That's a difference.
You didn't provide enough data to back up your claims that a single 980 can render something at 30 fps when in the same scene a 970 drops to just 15 fps. Even if this is true in 1 game, you need to provide hard data for 10-20 games before we take such a claim seriously. I find it hard to believe that a GTX980 SLI could maintain 30 fps when GTX970 SLI would only be 15 fps in the same scene.
I just want to let people know 980's price is justified. Spilling out nonsense like 980 is only 15% better for 50~60% of the price is not right.
It is right because that's the actual performance difference on average. The performance difference in SLI is
less because SLI doesn't scale 100%.
@ 1440P
GTX970 SLI provides 90% of the performance of 980 SLI for 40% less cost.
Alternatively, that's the same as stating that GTX980 SLI is only 11% faster than GTX970 SLI for 67% more money ($1100 vs. $660).
If 980 SLI is worth it for
you over 970 SLI, then that's perfectly fine because we don't know your income level, and how many hours you play game a day. Since you have a 5960X ($1000 CPU), 32GB of DDR4 3000mhz ($600-900) and Shure SE 535 ($450-500 headphones), you don't come off as someone who is strapped on money to not blow spend $400 extra on 980 SLI. For the rest of us, it's a bad choice. It doesn't change hard data that 970 SLI is the price/performance choice and that 980 SLI will
hardly provide a much better overall gaming experience with just an 11% advantage on average.
Using some random test with 16xMSAA isn't proof of anything. No one here would play Metro at 16xAA, so it's a pointless test. At least use DSR or super-sampling.
Also, I have to note, during scene's where it's really pushing the cards. The average fps between oc(1500mhz) and stock(1316mhz) is minimal. 1~2fps increase at best. For both 970 and 980.
This contradicts every review out there. You can overclock a GTX970 to match or pass a reference 980 in performance, but a GTX980 OC will still beat a GTX970 OC by the same 15-20% range in games that allow for the 980's shader and texture performance to shine. The performance increase on a 970/980 @ 1.5Ghz is A LOT more than 1-2 fps in games over stock.
Your comment that 970 and 980 hardly benefit from 1.5Ghz overclocking doesn't align with professional data. Almost 30 fps gain from a stock 980!
Also, clearly you can overclock a 970 to beat a stock 980, but no one ever made a claim that a 970 OC can match a 980 OC.
So the question remains: How does 2x GTX-970 versus 1x GTX-980 compare? For 4K, also?
It would also be a question if no one tested this. I am not sure if you haven't read any reviews since Sept 26th.
GTX970 SLI = $660
R9 295X2 = $660
GTX980 SLI = $1100 for 8-14% more performance at 4K over the other 2 setups (comparing stock vs. stock not OC vs. OC) Sure, you can overclock 980 more than an R9 295X2 in % terms but the advantage over the 970 SLI will remain nearly fixed.
Think about this, someone spends $660-700 on R9 295X2/970 SLI. Well when GM200 or Pascal drops, they'll get way more performance and use that $ saved while getting a setup 40-50% faster than a 980 SLI. If you can easily afford the best of the best every new gen, go for it. Otherwise, 980 SLI is simply a waste of $ vs. a 295X2/970 SLI.
If you look hard enough, you can find R9 295X2 beating 970 SLI at 4K by 38%.
Alternatively, you can find rare cases where 980 SLI beats 970 SLI by an unusually large amount.
So I guess then if all you do is play those games 24/7, then sure maybe there will be a 20% difference between 980 SLI and 970 SLI in some odd title.