Hi absic. Thanks for the quick reply.
I just checked again. The shape of the connector makes it impossible to fit it into the "top half" (pins 1, 2, 5, 6). It can only go into the bottom half (3, 4, 7,
. Also, the manual states:
1 - GND (only for 2x4-pin 12v)
2 - GND (only for 2x4-pin 12v)
3 - GND
4 - GND
5 - +12V (only for 2x4-pin 12v)
6 - +12V (only for 2x4-pin 12v)
7 - +12V
8 - +12V
and has the top left pin as 1, bottom left as 4, top right as 5, bottom right as 8.
Thanks.