PimpRig has posted a review up on a kit from FrozenCPU that helps you turn your old PSU into a modular PSU.

I don't think there is any retail site on the web that carries as many computer modding supplies and equipment as FrozenCPU does. They have the gear for just about any mod or add-on you could imagine. A popular modification that people have been trying out recently has been to turn your power supply into a modular power supply. What that means is fabricate your power supply so that you only have to plug in the cables you need for your configuration.

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