Hi Danna,
I asked around a bit and we do not have any hardware requirements other than what is listed in the PureCloud requirements article.
https://help.mypurecloud.com/articles/purecloud-requirements/
As far as an intelligent suggestion for a reasonable baseline, I was told that we could probably base them on the minimum requirement for the browsers that we support. For example, if the computer can handle Chrome to Google's specifications, they should be fine.
I hope that helps a little.
Thanks!
Clay