Nope. Sli increases performance here. Maybe the games you're playing doesn't support sli.

alankloskowski

Sajin
Nope. Sli increases performance here. Maybe the games you're playing doesn't support sli.

Come on man, give me some credit. I spent over 30 hours trying to fix this, do you really think I would overlook something as trivial as that? Not to mention I also said it happens across all games. :P

Sometimes it's the little things. 
 
What are your full system specs? What games are you having the issue with? Have you optimized the games with geforce experience?

I have complained about poor performance in SLI too in most of my games like BF3, BF4 and even Far Cry 4. You're not the first person to notice poor optimization in SLI for 900 series video boards.

MegaManDave
I hear you... I had a similar problem and tried for many hours to resolve the problem, so Hear are my suggestions:
 
You could try the  (I have also read that Geforce experience can cause issues, so maybe remove that from install)  or do a full and clean install from scratch it worked for me - extreme I know, but I had had enough of trying and spending many numerous amounts of time to resolve the issue.
 
I hope this helps.

I'll give this a try, thanks!

Zuhl3156
I have complained about poor performance in SLI too in most of my games like BF3, BF4 and even Far Cry 4. You're not the first person to notice poor optimization in SLI for 900 series video boards.

Now are you just having poor scaling, or is your performance decreasing up to 80%?

What motherboard are you using?

Sajin
What motherboard are you using?

asus p8p68-v Pro--I thought I was forgetting something lol
 
And I'll do that when I get home

Since I completed a fresh install I'm not having any issues.

I have 980ti kingpins and my BF4 experience at full ultra settings is 160fps at 1440 and thats capped... I could easily push harder.

Prior to that that cards were performing terribly in SLI on all fronts.

One other thing to look at is your 3D settings in your Nvidia control panel. I watched a really good youtube vid that explained all settings, if you want to take a look I'll dig out the link.

Have you tried BOTH cards individually and see if they both perform comparably, they will never be EXACTLY the same, but similar.  Also, have you tried testing both the cards in the secondary slot to rule out a slot issue, and lastly have you tried a different SLI bridge?  I have seen ALL of these issues before.  Personally when I went back to SLI again with my 580's on my X58, I had much the same problem, NOTHING seemed to fix it, out of frustration I tried a different SLI bridge, all the problems resolved.  So there are definitely some of the "basic" things that can cause this.
 
Also, this is more for information gathering, but, when I have had issues like this, I go into Precision and turn on the OSD, make sure frame rate, GPU Clock, Memory Clock, GPU usage, Memory Usage, and GPU temp.  Use this for both video cards and watch the stats like a hawk, if you can test in single player, preferably with godmode on for a bit so you aren't  trying to play, but more create load to see what is happening.  This way you will see if things are running at the speeds they were supposed, see if a card is throttling, etc.