How is that possible? that's immense amounts of damage reduction.
Is there a cap?
Edit: I bugged my way to act 4.
There's no cap but there's some pretty seriously diminishing returns after around 3150 Armor / 315 Resistances. For instance, that 10,428 Armor is 76.80% Mitigation vs Inferno enemies (yes, the stat screen is sort of lying; it's checking vs a Level 60); 3150 Armor is 50% Mitigation. The same applies to resistances.
I got them on my wizard only to find out about this afterward. But I needed the movement speed to reach the 25% cap anyway and it does have my int and vit on it so I didn't get too upset over it. Attack speed is just a luxury I'm adding now anyway since my dps is already so high and with my resource limited build I prefer bigger slower hits rather than running out of arcane power. I really need +arcane power on crit to be on my off hand but I couldn't pass up the +5% crit chance to Arcane Orb (my primary spell atm) in addition to the inherent 8.5% crit chance. I only have +arcane power on crits on my helm atm but it does help at 42% crit.
My Wizard has an Attack Speed build so the bugged IAS% kind of really sucks for finding equipment. Especially with a pair of pants as nice as Inna's since it lets me swap my Unity Ring out for something better.