hi,first let me say that i've got the newest m/b that has all kind of features you probably aren't aware of. go to www.gigabyte.com, under motherboards, click on ga-ex58-ud4p,in there click onto user's manual,download the pdf,on page 63 you will find hpet mode,,allows you to select the hpet mode(high precision event timer)for your windows vista os(windows 7 is the same as vista). select 32bit mode when you install 32bit,select 64bit mode when you install 64bit windows(default:32bit mode). this m/b is the ultra durable 3,with 2oz.copper pcb, i build this rig about 6 months ago, so by now there are more powerfull m/b that gigabyte has to offer, like the extreme, with heat piping for the north and south bridge with rear exit cooling radiadtor. in the bios it tells you to select boot type(floppy,cd,or hdd), don't know that it will reconnize partitions on drive when it trys to boot once i switch to 64bit mode. or do i have to set up with a raid array with a twin hdd, so that bios will know that there are 2hdd to choose from (one with 32bit and other 64bit).what do you think? or if i had both bits on same drive, at boot up time will bios ask my which bit to boot from once switched to hpet mode? thanks for all your help and it is a pleasure to speak to you.