Q6600 under dice

What's a realistic clock for these under dice? Got a few to do hopefully at the weekend and just need a heads up of a realistic target, haven't messed with 775 in a while and are not Totaly up to speed on settings etc but no doubt it will come back once I'm going, I had 10 mins play on air the other day and made 4ghz @ 1.38v only validation though so don't know how far it would bench.

I had a very good chip that I believe got me around 4.8 on dice. So shoot for the mid-upper 4s I would say

Thanks, I didn't want to go chasing a unrealistic target wasting precious time on no gain.