they go this high: http://valid.canardpc.com/show_oc.php?id=2295463
not with that board though..you might can get 4 Ghz-ish out of it..
If you have an ATX case ..this one might do for a budget board..http://www.geeks.com/details.asp?invtid=M4A88T-V-EVO-BO-R&cat=MBB
Those Ranas clock pretty nice!
That is very likely a benchmark run and not a stable overclock. The voltage is at dangerous level pretty much even with water cooling. So don't assume you will get anything like that out of your chip.
The Athlon and Phenom chips are both limited to around ~4Ghz with good air cooling. Unlike Intel chips AMD chips need to be as cool as you can keep them. Stay at 60C or less under load for longterm stability.