Try taking the side panel off and pointing some sort of fan (box fan, personal fan) at the cards. If your temps drop significantly then this is an airflow problem.

Are the cards right next to each other or separated by a slot? If next to each other can you separate them...will your board allow this? I think Fermi started out as a space heater and then got made into a GPU! They will gratefully take all the air you can move over them!
Lots of people complained about sloppy TIM jobs on those cards....might not hurt to have a look and clean out any dust while you're at it.

You could also check the voltages going through the cards and try undervolting them a bit...(MSI afterburner)

The cards had a single space between them.

I tried popping the case side off and blowing a fan on them, and it made them quieter. +75% down to +65% fan speed.
But over all the temps stayed above 90c

Like I said it idols at +70c. I don't understand why, as its the same board I used in my previous build, and I assumed that load balancing by adding a second would make it run cooler not hotter.

I have tried SLI on and off, and games still run high 80's low 90's.

The only way I have found to make the card run cool is to disable all monitors but on, and leave it to idol. Then it runs about 45c-50c.

I really hate the idea of opening up my cards, but I am feeling like I may have no outer route, as gaming is almost unbearable with two GPU's running 80% fan.

Is there a driver or gpu setting that may assist? Does anyone know how to make the card clock down with two monitors enabled?

You really NEED a side-fan with the 400 series. My single 480 runs at 90C in the summer heat (~90-95F) with 100% fan and all my case fans on full. They just run extremely hot.

I used to watercool just the core and it made a HUGE difference to noise and temps. I actually regret removing it all now.