Select Language:The difference in CPU usage you’re seeing between t3.nano and t3a.nano instances mainly comes down to the type of processor they use. T3a instances run on AMD EPYC processors, while T3 instances use Intel processors. For burstable instances like these, this is important because they work based on a system of CPU credits. When your usage exceeds this level, like the 8% you’re seeing with t3a.nano, the system starts to use up CPU credits. However, if your workload constantly pushes CPU usage higher, it might run through credits faster, which could lead to performance issues over time.