Just an update:
Under Windows XP I still experience BSODs with the V-RAID driver. With the 5.18A Hyperion package the BSODs were quite seldom (one or two times in a couple of weeks), but still there (allthough it contains the same V-RAID driver as the 5.16A package, see above). Now with a new version of the V-RAID driver (in Hyperion package 5.20A) a BSOD occured a few minutes after reboot.
On my Asus A7V880 (KT880 chipset) I will continue to use the V-RAID driver 5.60A (from the Hyperion 5.15A package). This never made any problems.
Overview:
Hyperion Pro (V-RAID) -> Result
5.15A (5.60A) ->
Good
5.16A (5.70A) ->
Bad
5.17A (5.70A) ->
A bit better
5.18A (5.70A) ->
Much better, seldom BSOD
5.20A (5.80A) ->
Bad again
5.21A (5.80A) ->
Good (at least after two weeks running)
[EDIT]See also my post below.[/EDIT]