sata read caching and ncq questions?help

I have 3 satas in rain 0. I used hdtach to benchmark them. when i turn off ncq and read caching the benchmarks rises up in term of bursst speed and ave. read speed. Isn't ncq and read caching be more faster if their turned on or not? i confused their suppossed to make hdd faster aren't they?
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More about sata read caching questions help
  1. but in my benchmark results when read caching is turn-off the results from the benchmarks rises thatn it is when turned on? anybody?
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