while the ant miner will draw  355watts on freq 218 or  freq 225  that is based  on a quality Gold rated psu.

your psu is rated 20 amps per 12 volt rail    and 34 amps combined for its two 12volt rails.

  If I knew  that each pcie wire drew from the separate rail  1 + 2  you may be able to do freq 200.  But many times your lower quality psu  will use one 12 volt rail for both pcie's and the other 12 volt rail for  the motherboard.

I also am pret sure your  psu is bronze not gold so it will use 385 watts not 355 watts.

So I am trying to keep you safe by saying try the freq 175 setting not the stock 218 or 225 settings.

If it runs 2 days in a row at freq 175 bump up a little higher.