Quantifying the load on SQL Server 2008 from brute force attacks?

I have a SQL 2008 box that has been the recent target of brute force attacks on the "sa" account (silly kids . . .). Is it possible to quantify the server load of a single attempt at logging in to SA with a bad password on an account that is also disabled? I'm mostly interested in CPU load and I'd have to do it retroactively since that box has been taken offline. I don't开发者_StackOverflow中文版 have to have an exact value, just a value that I can use as a heuristic and extrapolate out to the number of requests.

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Best way to prevent Brute Force Attack on SQL Server is to disable its remote access and don't expose it on to the internet.

http://iskrov.info/2013/11/how-to-disable-remote-access-microsoft-sql-server/