Estimating NTDS.dit size increase for Credential Roaming

I found this thread about estimating the size increase in the NTDS.dit file after enabling Credential Roaming:

http://blogs.technet.com/b/instan/archive/2009/05/26/considerations-for-implementing-credential-roaming.aspx

It provides this formula: (((CertificateSizeInByte + KeySizeInByte) * (#UserCertificates * #PastCertificateRenewals * #Machines) + (DPAPIkey * ProfileAgeInYears * 4) + DPAPIpreferredfile + (#StoredUserNamesAndPasswords * 400)) / 1024

However, since this was published a hotfix was released to decrease the database size:

http://support.microsoft.com/kb/2520487

I'm wondering how to calculate the impact of Credential Roaming on the NTDS.dit file after applying this hotfix.

Thanks