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How Hot the Heat Sinks Inside a PSU?

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I am modifying a Corsair CX500 PSU to power my Mendel90 variant. I have clipped the un-needed wires short inside the PSU case (twisted, soldered and insulated the same colored wires together) and now want to tuck and place them neatly so they don't touch the PSU fan and then close the case.

What I want to know is how hot do the aluminum heat sinks inside the PSU get when the PSU is running? Can the bundled wires touch them? I am assuming they won't get hot enough to bother the wires but I don't know and the last thing I want to do is melt plastic inside there and maybe cause a short or fire.

Thanks for any advice or comments.

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