There are many reasons GoDaddy would limit the amount of resources anywhere from vendor limits, resource availability or service level agreements @Mike12. Different plans have different resource allocation so depending on the plan you choose you can expect more of less resource availability.
If looking at the details of the hosting plans does not contain enough information for you please call support and they can provide you detailed information. I hope that helps?
...turns out that my two cents is worth less or more depending on the current exchange rate.
roy darling *my posts seem a lot shorter in my head