Thanks, green granite, but I have the manual along with the words you quote, and this is part of the confusion.
The ATX plug from the PSU is 4-pin
The PSU also has an 8-pin plug but it isn't ATX, even though it fits perfectly
The ATX socket on the mobo is 8-pin with none of them covered
So, do I use the 4-pin plug because it is ATX, or do I ignore the nomenclature and use the 8-pin plug?
The mobo userguide doesn't help as it only shows pictures of connectors - both 4 and 8 pin - connected to the 8-pin socket, and makes no mention of nomenclature.
Ta.