ATI 2900XT problems

Just installed a Sapphire 2900xt graphics card in my xp based system, now
I've been having all these problems with the desktop going blank and locking
solid or vpu recover resetting.
System is a quad core 6600 Intel cpu (stock speed, water cooled) Abit AW9D
board, 3 gig ocz 800 gold memory,sata2 500 gig Maxtor hd, Hiper TypeR 580
watt ps,XP sp2.
I've been pulling my hair out with this one trying all sorts of configs and
drivers, got the latest BIOS for my board etc. I was just begining to face
up to the fact that maybe my power supply wasn't up to the job although all
my voltages showed good healthy readings. I was having a last resort fiddle
with settings in the ati ccc after there was some corruption on the screen,
i disabled vpu recover and the screen corruption disappeared. I then went
on to run all my usual programs with no problems, I even ran ATI tool
artefact detection, Prime95, Graphics Card Stability Test, CPU stability
test, Firefox and my Wintv2000 all at the same time and still no lockups,
all voltages read healthy and nothing is overheating. Could the vpu recover
in the latest ati drivers be dodgy and is it ok to disable this function,
anyone have similar problems?

cheers

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"My madness is my sanity, to say I wasn't mad would be insane"