You could try the Asus forums as they might be able to shed a little more light on your problem
http://vip.asus.com/forum/topic.aspx...Language=en-us
But from what I have been reading on the asus boards BIOS 1001 aint to hot and you may have to leave your timings relaxed a little until the next update is availiable.
It may be helpful if you list your full spec as this may shed some extra light on your problem, CPU, PSU, GPU etc.
Running at 5-4-4-15 shouldnt make much difference from 4-4-4-15 I dont think you or I would actually see a difference.