It depends, and without a lot of added information I can't say for sure. You previously said that buffer pool was only using 51GB after the patch so you might not have ramped up completely or the workload just doesn't require all of the memory available in which case, this is all a wash. Your internal pressure or IsProcess = 2 for the low notifications are likely due to an ad hoc workload or plan caching issues. It could be something else, but this is most commonly the area that triggers internal memory pressure issues, and you might check your plan cache usage with the queries from Kimberly's blog post:

http://www.sqlskills.com/blogs/kimberly/plan-cache-and-optimizing-for-adhoc-workloads/[/url]

If you find heavy single use plans with lots of wasted cache space, 'optimize for adhoc workloads' should be enabled to reduce the effects on the server. This is the most common problem I see with IsProcess = 2 but others could still exist that aren't related to plan caching.