I was reading some of the docs at gamefaqs, and saw 2 conflicting information pieces.

One faq said the attrib multiplier per level is 3-15, which implies you can get three 5x bonuses:
http://www.gamefaqs.com/pc/913818-the-elder-scrolls-iii-morrowind/faqs/19356

Another says the max per level is one 5x and two 2x, so a total of 3-9 attrib. I'm assuming the latter is correct, based on the other forum posts. Is that true? thanks!

You can get 3, 5x multipliers.

Don't know about this particular case, but a lot of FAQs were written before the final patches came out.
FAQs are also written by humans and obviously subject to error.
It's the old story, "Don't believe everything you read".

You could have *5 multipliers for all attributes if you wanted to (though that would be wasteful )