My 6gb kit works fine with my Gulftown, the 12GB kit works fine up until 9gb or so. I haven't done any synthetics to see if my bandwidth is fine... If the results arn't conclusive I'll pop my chip and take it to my friend's place to test on his board(at least I'm pretty sure he'd allow me).
The reason why I'm concerned about this is several people are not having the problem with 12GB! I agree it might be a software issue, but we can't be sure since some people don't have the problem...
I'll try turning off HT tonight and testing to see if it helps. I'm currently running all 18GB at 1833mhz with uncore x2.
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