Question CPU cooler is blocking 8 PIN ATX12V connector

[ds3439]

I installed the CPU and cooler and have put motherboard in case, but the CPU cooler is so large and can't get the ATX12V cable in (top left of motherboard).

 

[rgd1101]

exact model of the motherboard and cooler?

 

[ds3439]

Motherboard - ASUS ROG Strix B450-E Gaming
CPU Cooler - Be Quiet Dark Rock TF
Case - Phanteks Eclipse P300

I took the cooler out and inserted the power cable, reapplied thermal paste and remounted cooler. Still very tight even on an ATX board, hardly enough space
to reconnect the Fan header once everything is in the case.