my AX-850 8-pin connectors was too short to route round the back. So it's routed between the motherboard and the motherboard tray. So you will want over 600mm cable length on the 8 pin connector. And that's with the PSU oriented the right way (fan at the bottom). Inverting the PSU will also require longer cable length.
As for the rest, length is OK, although the HDD power cable are also a stretch (AX850 SATA power cable 4 slots is 400mm+150mm+150mm+150mm long).
In all honesty, I think any power supply will struggle with cable length. But something like 650mm 8-pin connector length will be ok. Else you will have to be creative with routing, or use an extension.