1600x10.5=4200Mhz , 1.41v is stable I think ... I hope...
EDIT:
1.5 h Orhtos pass
What BIOS are you using? And what are your settings besides vcore to get 1600 stable? I'm on 1401 for now but I've not tried FSB OC with it yet (doing 333x11.5 right now).
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