Timings on a P4 478 don't matter at all, slackest helps then tweak them up there after.
Set the timing to the bigegst number you can thats the slackets ie: slowest and allows for you to oc, then you can tweak them by making the number smaller thus making them tigther ie: fasters
What hSF you got? I say get a XP-120 and some AS5, decent fan for cfm's and ya set good to go. I had an xp-120 i lapped her and temps went down laods, aslo clocked lots more
Oh have you though about a newer bios? I've a beta version and i don't even see a bios screen when i run @4.2ghz it's that silly fast heheheheh