Cloud Mercato tested CPU performance using a range of encryption speed tests:
Cloud Mercato's tested the I/O performance of this instance using a 100GB General Purpose SSD. Below are the results:
I/O rate testing is conducted with local and block storages attached to the instance. Cloud Mercato uses the well-known open-source tool FIO. To express IOPS the following parametersare used: 4K block, random access, no filesystem (except for write access with root volume and avoidance of cache and buffer.
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Introducing R8G: The most powerful, energy efficient AWS chip ever built - AWS OnAir S05

If you compare the top bin 64-core R7g to the top-bin 64-core R8g instance, the R8g instance provides 30 percent more performance, it costs 10 percent more, and has a price/performance that is 15.4 percent better.