Seriously. It seems like you didn't even read my post, nevermind the patent.
The Performance-PC's unit is certainly "modular" but it's not modular in the same respect.
Ultra did not patent the "concept" of modularity. They patented the modular interface on the housing. I think that's where you're getting hung up.
The Performance-PC's unit does not have a modular interface. It has what can be perceived as "shorter cables with standard cables that can be lengthened as necessary."
So the Performance-PC's unit is not prior art for the Ultra patent. The Performance-PC's design would not infringe on Ultra's patent if it happened to come out after the fact. The Ultra patent is "legit".
Seriously, read the patent. The scope is actually pretty narrow. For example: Would a redundant power supply not have the same kind of interface a modular power supply uses when it's installed into a chassis? Yes. But the patent narrows the claim more by stating the application of the device.
Seriously, if you're not going to read what you're referencing then you're trolling. At least you admit to not reading it... I'll give you credit there.