The solution to the P5WDH powering off during restart is, don't restart the rig just select `shut down` and the board powers down normally, then just switch it back on again.
Or install all your software without overclocking, restarting as neccessary, then when your done crank it back up.
My P5WDH is running @3.3Ghz Orthos stable with an E6600 on air with the geil 6400 ram, which is delivering 7300mb/sec in Sandra.
I used to use abit boards all the time until i was stung by their faulty capacitors on the BE6 boards, nearly put me out of buisiness a few years back.
I had to replace 6 failed boards with swollen capacitors. I wouln't touch abit again if they payed me.
Alternatively, look at a 965 board they now support crossfire.