I installed this bios 1704 and the score in CB r15 dropped 100 points.
The best bios until now for me is 1302.
1602 OC not stable
1504 OC Stable CB r15 dropped 100 points like 1704
1401 Not Tested
9900k @ 5Ghz
Maximus XI Extreme
16gb 3200Mhz CL14