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Question:

Are the 20 to 24 pin motherboard power cables safe?

NO power convertor needed? I can go straight from AT to ATX?

Answer:

It's okorder /
You are confused between AT and ATX. As described by pdl756 the power connections are different and two plugs. Another big difference was the AC went from the PSU to the Start switch on the P.C case and back to the PSU for switch on. AXT started with a 20 pin power plug and later to a 24 pin power plug. Your link shows that converter from 20 to 24 pin but it was not needed for long because PSU manufacturers provided a 20 plug plus a 4 pin clamp on extension

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