Rx 580 sapphire nitro+ power usage

Hi,
I am currently using 6x rx580 sapphire nitro+ hynix mem 8gb
Bios mod:
Copied this strap:

777000000000000022AA1C00B56A6D46C0551017BE8E060C006AE6000C081420EA8900AB030000001B162C31C0313F17

Into the 1750-2250 strap and set the volt to -75mv using trixx.


My problem is the watt consumtion.
The rig draws 1500 watt and i think this is not normal.

I would really appreciate any tipps regarding the power drawn from the wall and if this is normal.

Edit: i tried to run
Mobo with psu and ssd(130W)
Mobo with psu , ssd and 1 rx 580 (350W)

So the rx 580 draws something like 220W but shows only 145 in gpu-z

I think this isnt normal at all