I have got into windows with the 200 strap but I have no idea what settings I was using, it was awhile ago. Also I have never had the bios lock up on me, perhaps your settings are not stable? (The only time Ive had bios lockups on other boards was when the settings were very unstable). If your stable and its locking up, it may be a bad bios flash - try re-flashing it but make sure you system is on stock settings and stable when flashing - I usually leave the vcore/Vtt/vNB on what it needs for 4GHz and run it at 3GHz, and have the vdimm at what the ram needs for 1066 and run it at 800 when I flash.