SAP HANA peak used memory exceeds the global allocated limit

Hello Experts

There are many discussions that happened in the forum about the memory utilization and limits.

I have been seeing this symptom in our HANA systems quite a number of times and posting this for clarification:

During the business hours the memory usage is used to the peak and usually settles down during non-business hours.

Below overview page shows the Peak Used Memory as 129.08 GB vs. Allocated GB is only 128.

What is the concept here of Peak Used Memory exceeding the Allocation Limit ?

But after couple of minutes this came back to 125.69 GB. And when I ran an SQL query from the snapshots go the below output and I will never get the Peak Used memory as 129.08 or 125.69 GB and it bit lesser that what it shows up in the Studio:

What is correct Peak used memory here ? Which one is true ? Where I do get the correct and reliable information ?

Thanks

Srikar