Hello guys

I have build new mining rig with the following HW :

Motherboard - Asus primer Z270-A - with the latest bios update {version 1009 }
* modify in bios for GEN2
 
PSU - Corsair AX1200i
GPU - SAPPHIRE NITRO+ Radeon RX 580 8GD5 ---- > One card only for now.
RAM - 4GB
Windows 10 latest version 1709

For some reason I'm getting only 17 MH/s ! out of the box with out flash the GPU .

is it normal if do not flash my GPU ?
form what is saw after the flash people said that they  have 24 mh/s  and it go up to 27 mh/s ~
but Im to far from this number ,
what should i do ?
I will appreciate any suggestion
thx in advance