666MHz@cas7 vs 800MHz@cas9

1333 CAS-7 most probably, lower timings, but Id still the 1600MHz. There's not a lot of difference.
 
They would pretty much counter-balance each other. Raising the mhz (good) also means raising the cas latency (bad). There would be so very little real world difference, I don't think you should even worry about it.
 
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