Not sure if you are describing the same issue - when using 6GB, my GFLOPS are as normal. When using 12GB (of the same model ram) the GFLOPS are at a lower level.
You seem to be saying you have a single 6GB kit that when used alone is coinciding with low GFLOPS.
In all honesty I dont care what LinX says, it isnt coded the best and has always had problems with hexacore, also HT, now this weird lower GFLOPS issue some are seeing when using 12GB. I am almost 100% certain its just buggy software, and proper apps can and do make use of 12GB when its installed. Im only focused on real world performance I just use some synthetic tests to verify stability under high stress.
Verify your bandwidth with AIDA64 or everest, do some SPI32M runs, some Prime and some LinX (no matter how poorly the latter works) and you'll notice everything is fine except LinX. That doesnt indicate a problem with hardware - just that program. My bandwidth is good with 12GB, and everything else runs beautifully.
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