Reviews and Problems with ASRock Fatal1ty P67 Performance
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Poor quality but working after trial and error
B. Levine "recycleguy", Amazon
1 January 2012
Summary: Got error on attempted boot. Turned out if you follow the directions for multiple memory chips and put in slots 1/3 or 2/4 to get dual channel performance, this MB did not recognize the memory as valid. I had to ignore the suggestion and use slots 1/2 to get the MB to boot into BIOS, and BIOS confirms I am getting single channel performance. And yes, bought pair of memory cards in a single pack, meant to be installed together.