is xbins the only place to get these? also is there a place i can go that tells me what bios files are available for my certain chip (xecuter 2.1 pro) and what the different things they allow. do you guys find a single bios that works good for your chip and then pretty much keep it that way, or do you trade off and try others? im trying to figure out why there are many different bios files out there and if people switch often and why. thanks.