forumstartw wrote:
Intel 的 XT...(恕刪)
對不起 原來我搞混了 是 ASUS 不行 MSI 可以

It was ASUS, not MSI, that won't write their BIOS on the ASUS G74SX series to support memory speed above DDR3/1333.
Kingston HyperX DDR3/1866 runs just fine at full speed in MSI models, but the Intel HM67 & HM65 chipsets will only support up to 12GB and still run with stability. Over 12GB of DDR3/1866 will overload the memory controller and cause problems in daily use. This is not true of DDR3/1333 or DDR3/1600, they run just fine at 16GB and above.
Kingston HyperX memory that purports to support Intel XMP will ALWAYS run at DDR3/1333 unless there is the ability in the laptop's BIOS to change the memory profile. Neither ASUS, MSI (and therefore PowerPro) or Sager have this capability in their BIOS. So, when you install the Kingston memory with the part number that ends with an X, it will only run at DDR3/1333.