are they in open rig or in box also 95C is to much for this cards... you should run them below 85C according to manufacture.

I own two 7990 as well and without undervolting / underclocking you will get this kind of temps...

if you are running windows just get msi afterburner and change voltage and mem clock.. .you need find your sweet spot where you can hash stable and keep this same temps...

post some pictures of your rig and what's in your confing and i will be happy to help.