By Host Controller, are you refering to the Modules or the Northbridge itself...
Its the northbridge as it cant process all the data from all the dimm slots fast enough when set at full speed. Thats why two 2gb stick are better as it only use`s two dimm slots and this helps the mhc.
ASUS RANGER VII
i7 4790K
8GB CORSAIR 1600 xmp
BE QUIET SHADOWROCK SR1
EVGA GTX 770
2 X 840 EVO SSD
CORSAIR AX850W
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