SLI 1070's or new 1080Ti/RTX series?

[liamtrades12]

I build my current system back in 2016 when I had only two 1080p monitors on the system. Now that I am getting into day trading, I want to add a third monitor to the setup and upgrade my main monitor to a 120hz 1440p monitor at the minimum, maybe a higher resolution, for gaming. My concern is that my 1070 STRIX won't be able to keep up with the demand of all three monitors. 

 

I've been looking into the possibility of getting a second 1070 and putting them in SLI, but with the new NVLink coming out and more powerful cards like the 1080Ti and the 20 series cards available I was wondering if it would even be worth it to spend $500 on another STRIX 1070 card and SLI? If not, what would be the better route, 1080Ti or 2080Ti? I don't do any crazy rendering or video editing, I need the card primarily for gaming and for charting using TD Ameritrade's thinkorswim platform. That trading platform can be a little taxing on the card when you have it set to a very refined view like 1 minute but overall it's nothing like a 4k render in premiere. 

 

TLDR: Is it worth spending $500 on a second 1070 or should I upgrade to a 1080Ti or 2080Ti?

[TVwazhere]

1 minute ago, liamtrades12 said:

TLDR: Is it worth spending $500 on a second 1070 or should I upgrade to a 1080Ti or 2080Ti?

I spent $500 on a used 1080ti. No way another 1070 is worth that much even new

 

Also

 

1 high end GPU>2 mid end GPU's. Almost Always. 

[kontradictions]

The biggest problem with SLI is that it scales very differently depending on games. Some games scale decently while some don't show any improvements or even perform worse than running in single card mode. 

 

The best advice I can give is come up with a list of games you play and see if SLI scales with the titles. Don't just look at FPS because it doesn't show things like microstuttering. The most reliable and consistent setup would be a single more powerful card.

[Acid Panda]

1080ti imo.

SLI causes 'issues' and as yoou probably know is more suited with some exceptions to professional work/workdoads.

but if you spending the money then a singular 2080ti will perform best but not by that larger a margin. also depends on if you really care about RT.

[ad1das]

One Stronger card over two weaker ones... always.

[DailyProcrastinator]

There's tons of great options for used 1080Ti's. That plus what you can sell your 1070 for might only be a $200 difference. That's definitely the best option.

[liamtrades12]

24 minutes ago, Acid Panda said:

1080ti imo.

SLI causes 'issues' and as yoou probably know is more suited with some exceptions to professional work/workdoads.

but if you spending the money then a singular 2080ti will perform best but not by that larger a margin. also depends on if you really care about RT.

so if the performance benefit is only minimal between the 1080Ti and 2080Ti what is the real benefit of the 2080TI? The new architecture? 

[TVwazhere]

Just now, liamtrades12 said:

so if the performance benefit is only minimal between the 1080Ti and 2080Ti what is the real benefit of the 2080TI? The new architecture? 

2080ti is about 15-35% better than the 1080ti (depending on game and resolution). But it's over 50% the cost of a 1080ti

[liamtrades12]

2 minutes ago, TVwazhere said:

2080ti is about 15-35% better than the 1080ti (depending on game and resolution). But it's over 50% the cost of a 1080ti

In that case is NVLink and the supposed other features that developers need to support for the games worth the 50% cost variation?