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In this particular case TX and PX are referring to PSUs complying with certain third party certifications, and have a specific quantifiable meaning. So in this
by dagw 2y ago
In this particular case TX and PX are referring to PSUs complying with certain third party certifications, and have a specific quantifiable meaning. So in this case Tx is always "better" (or at least not worse) than Px in a very specific sense.