@slaw I can answer that I think
The OFC series is OCC (ohno continuous cast) cryo copper. That copper more expensive even lower noise floor and different design and sound too
The regular original power cable I believe uses non-occ ofc cryo copper. I own about 12 of these really good to me for the price, some short ones only $65 nice drop in noise vs regular cables no doubt but not as good as the OFC series OCC
Would like to comment more, iceage deserves attention! Yes I am a fan. Enjoying the OCC cryo XLR today, nice extra fluidity in stage, not too aggressive or over focused with matrix pure dac using silver i2s out of clock into WA22 vs my other more expensive XLR it is the best choice, smoother vocals, even a bit of relief with such an aggressive setup some of the time for me with these. Nice to have these around.