I got a few betas here Loud (H82 dates from end of march), but can't test it with 3570K...
H81 beta here : https://dl.dropboxusercontent.com/u/66364457/MSI/MPOWER/E7751IMS.H81.rar
H82 beta here : https://dl.dropboxusercontent.com/u/66364457/MSI/MPOWER/E7751IMS.H82.rar
Was mainly to improve RAM compatibility, too bad Samsung support went downhill... always flash with ME included !
We had most succes with 17.6 indeed, don't try to push the rams too high (PSC and BBSE), with some rams the board is more stable with 4 dimms then two