Overture limits the number of times a computer program can automatically change your bids. There is no limit to how many times you can manually change them at either Google or Overture.
However, although Google has repeatedly assured me that bud changes do not affect your ads and do not have to be approved, I am not the only person who has reported seeing volume drop after bid changes.
For this reason, you may not want to be changing your Google bids as frequently as you may wish to change your Overture bids.
At Overture, better results can be obtained by changing bids whenever you lose the position you wish to target. Since bidding at Google doesn't ensure any particular position, changing bids isn't as precise nor needed as frequently there.
The other reason it is not as critical is that there is a much wider range of bids available to ensure your ad is seen at Google (8-10 positions on the first page) than there are at Overture (where some partners take only the first two, three or six ads).
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