The phrase "sufficient magnitude" means that something is big, enough, or significant enough to have a noticeable or important impact or effect. Full definition
They are not of sufficient magnitude to have much effect on the observational records, which end about 1960, but may have a measurable effect in the near future. (skepticalscience.com)
Are any of them of sufficient magnitude to affect prospects for the end of history? (firstthings.com)
«Gifted, determined, ambitious professionals have come into investment management in such large numbers during the past 30 years that it may no longer be feasible for any of them to profit from the errors of all the other sufficiently often and by sufficient magnitude to beat market averages.» (theirrelevantinvestor.com)