IMO, should be right. I never took Sandra seriously.
Comparing yours 74GFLOPS @ Core 4200 / UnCore 3360 / QPI 3696 / RAM 1680
against mine 54GFLOPS @ Core 4200 / UnCore 3600 / QPI 3600 / RAM 1600
looks right. With 50% more Cores you could have 81GFLOPS, but the difference comes from slower UnCore speed & higher RAM timings.
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