That's a big increase, do you think it's just the change to Emerald Rapids? My QYK8 has similar memory bandwidth compared to your Q2SR with 4800MHz sticks. I do have a Q2SR on order though...My current setup with Emerald Rapids Q2SR, GB MS03-CE0, and 8x32GB Micron 5600MHz have bandwidth:
AIDA64 7.60.7300 - Memory Read 313,19 GB/s Write 251,39 GB/s Copy 278,45 GB/s
My old setup with Sapphire Rapids QYFS, AS W790E-SAGE, and 8x16GB Kingston 6000MHz had bandwidth:
AIDA64 7.00.6700 - Memory Read 234,30 GB/s Write 173,16 GB/s Copy 188,02 GB/s