Hopefully Patriot will get back to you and swap out the sticks for another pair to test. Patriot doesn't seem like they'd BS their claimed speeds by as much as these differed.
Afraid not. The OCZ kit runs up to almost DDR3-2000 on the same board. I literally swapped the kits over without changing any settings to eliminate that as a possible issue.
Funny u posted that. I was thinking about the Q6600 vS mobo, and what results an AMD cpu and `whatever ddr3 board` would make of it. Memory results alone u understand.
Something is holding something back by the looks of things. Feedback would answer some questions.
What performance level were the tests completed at in the end?
And how much voltage did you try on the NB?
I found I ran out of NB voltage rather quickly on the P5K3 when testing some Ballistix... been thinking about trying a voltmod ever since lol (or buying/trying X38 or X48)
Here's some Ballistix at 2000 just for ref. (unstable)