Total :3x /F4-3600C15-8GVK
1x/F4-3600C15D-16GTZ
Hardware : i7 6700K
ASRock Mocf
Seasonic 1250
32 bit OS
Bios: default CPU/3700 single side B-die pre-set
Procedure:
3866 single bin
booting with both installed then bumping bclk in OS

First kit of Ripjaws (with mellow third's this are not to bad ) 6 4 combo is hard/1.91v real

Second kit: fail 3866 specs up to 1.9v in bios
Third kit:one dead module
Here is TZ kit ..typical B-die this days ../rejects -each single module did 2000 tight but tandem fail to go north of 3866



Thanks and hope you will have a better luck