Highest legit with the Rampage methinks:
http://hwbot.org/community/submissio...hz_4939.92_mhz
As this one is wrong, 13x multi?
http://hwbot.org/community/submissio...hz_5005.13_mhz
But overall seems P35 seems to be the best, although that may be due to the time at which the cpu came out.