Intel 4.5GHz & 5GHz LinX Stable Club

[zoson]

Today I switched out my memory from 8GB to 4GB but they had tighter timmings but I got a lower Gflop, any reason for this?

Larger problem size usually means more gflops if everything else is equal.
For example, my 12gb kit at 9-9-9-25 gets ~86GFlops at 2GHz with cpu at 4.2, while my 6gb kit at 7-9-7-20 gets ~83GFlops at 2GHz with cpu at 4.2. The difference is the problem size with 12gb is ~9GB, and the problem size with 6gb is only ~5GB.