It looks like it lets you control the voltage on the lines. This is from antec product page.
User-adjustable, individual dedicated circuits for +3.3V, +5V and +12V outputs. Get all the power you need when you need it most, and adjust it to your system?s needs.
I dont think you need that. I own the TPII 550. Its great. I have no use for changing voltage myself, but to each his own. Get the cheaper one.
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