Maybe a little less, I turned off the endurance test to turn AHCI back on and do a couple of benches, so about half an hour of wasted time.
What happened was that just after I did the benches for the 520, I changed the CPU in my HTPC endurance box to a 2.7ghz core 2 E5400. At this stage I reset the bios and that caused the system to go back to IDE enhanced mode rather then AHCI.
Didn't notice until yesterday that NCQ wasn't working.
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