I have hardware that requires 1300W.
What am I missing?
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Unless you have some sort of load balancing equipment where both PSU's are hooked up fully (with the 20+4pin connectors), it's much better to run a single PSU.
PSUs are designed to handle a load that's dispersed across several outputs. Depending on the protection options your PSU provides, if it detects a large uneven balance internally between the outputs, it will likely turn itself off.
If you're talking about 2 PSU's for one computer, that only works if it's a server and both PSUs can handle the full load, which are used as fail-overs, rather than load balancing.