Today I decided to test my 4GB G.Skill HZ (F3-12800CL7D-4GBHZ) memory set.

Results were similar to my previous tests with these sticks. Chips are D9JNL.

800MHZ 8-7-7-18, 2.0V (500x8)
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854MHz 8-7-7-18 2.0V (533x7.5)
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875MHz 8-8-7-18 2.06V (547x7)
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900MHz 8-8-8-18 (2.08V) (563x7) starting to loose stability here...
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916MHz 8-8-8-18 (2.08V) (572x7) not much stability left.
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No problems with basic 800MHz settings (up to 875MHz)
Like I said earlier, these memory sticks did the same with X48 and 790i / 790i Ultra.

New P5Q3 revision is better than the old. That is for sure