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I currently have 6GB DDR3 666MHz, worth upgrading? - CPUs, Motherboards, and Memory - Linus Tech Tips
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Why Task Manager shows 1333 Mhz and not 2666 Mhz despite adding 2*2GB 1333 Mhz (DDR3 KIT) and CPU-Z shows Dual Channel & DRAM Frequency at 665 Mhz? - Quora
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