XIII. HYPERVELOCITY ARMOR
At some point before attaining Extremis, Stark built a prototype suit called the Hypervelocity armor.
The Hypervelocity armor had several defining characteristics. First, it had the ability to upload Stark's consciousness into a digitized form should he be incapacitated. Second, the armor's processors benefited from a radical increase in computing power compared to armors prior to Extremis. Third, it possessed pure speed and maneuverability befitting its namesake.
STRENGTH
The Hypervelocity armor made use of extra knuckle plating for added striking power. From Iron Man: Hypervelocity #6:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocityStrength01Hypervelocity6.jpg
DURABILITY
The Hypervelocity armor could tank the blunt force of several mechs hammering him with "an average of 15.39 strikes per second." From Iron Man: Hypervelocity #6:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocityBlunt01Hypervelocity6.jpg
The Hypervelocity armor had excellent resistance to piercing damage. Anti-aircraft fire doesn't put a dent in it. From Iron Man: Hypervelocity #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocityPiercing01Hypervelocity1.jpg
Its resistance to energy-based weapons shines through here. Even though the Hypervelocity armor suit was exposed, laser and railgun batteries do not take it down. From Iron Man: Hypervelocity #5:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocityEnergy01Hypervelocity5.jpg
The Hypervelocity armor was highly resistant to extreme temperatures. High-intensity fuel-air explosives engulf the Hypervelocity armor but don't slow it down. From Iron Man: Hypervelocity #5:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocityTemperature01Hypervelocity5.jpg
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocityTemperature02Hypervelocity6.jpg
SPEED
The Hypervelocity armor was the fastest suit in terms of flying speed. Here he literally catches "a missile traveling twice as fast as a rifle bullet" and then he boosts its speed further with his own bootjets. From Iron Man: Hypervelocity #2:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed04.jpg
It wasn't just pure flying speed that the Hypervelocity armor excelled in. It was its maneuverability as well. Here, at supersonic speeds, he makes turns at impossible angles, "[c]ompletely redirecting its trajectory at random -- over five times per second -- pulling G forces that would've pulped the organic Tony Stark's brain..." From Iron Man: Hypervelocity #1 and 5:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed01Hypervelocity1.jpg
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed02.jpg
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed07Hypervelocity5.jpg
The suit's "electronic analog of a nervous system is capable of far greater reflex speeds than" he was capable of in a traditional suit. From Iron Man: Hypervelocity #2:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed03Hypervelocity2.jpg
Here, he catches a railgun bullet between his fingers underwater. From Iron Man: Hypervelocity #4:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed06Hypervelocity4.jpg
But it was its processing speed that made it even more formidable. The Hypervelocity armor upgraded itself to break the human-level cognitive clockspeed barrier so that it "thinks, reacts and kills ten or fifty or a hundred times as fast as an organic human. . . . To put it in cape terms: Imagine the Hulk moving too fast to see, like that Quicksilver Euro-pansy." From Iron Man: Hypervelocity #3:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Specialty%20Iron%20Man%20Armors/HypervelocitySpeed05Hypervelocity3.jpg