because most stock 975s struggle to get past 420 or so (highest that I've seen was ~500 but that was a modded board) whereas some stock 965s do over 500. Booting at 450 on a 975 with a stable overclock is a relatively rare experience.I don't know why you say the 975 can't OC as well as the 965 since the best Conroe board is the P5W-DH, which of course is the 975X chipset...
Only thing the P5B can do is change multipliers... but even with that a better OC isin't guaranteed...
And which 965's can get past 500 with ease? Show some links.
