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I just assembled my new PC and it screams, BUT it's only recognizing 8 GB of RAM in BIOS and OS rather than the installed 12 GB. In the BIOS the RAM was registering at 1066 MHz so I set it to 1600 MHz. I updated the BIOS to the latest non-beta release.

  • OS: Windows 7 Ultimate 64-bit
  • Motherboard: ASUS P6X58D Premium
  • CPU: Intel Core i7 920
  • RAM: CORSAIR XMS3 12 GB (6 x 2 GB) 240-Pin DDR3 SDRAM DDR3 1600
  • HDD: Intel 80 GB SSD SATA II
  • Power supply: Kingwin 1000 W Modular

I've installed the Beta BIOS 0808 but no luck!

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Drop RAM speed to 1333 MHz, most memory controllers on the CPU won't be able to run all 12 GB at 1600 MHz.

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I've been tinkering with this for a while and it seems like the 3rd channel is just dead. No RAM registers. I have a new mobo en route. – hunter Apr 28 '10 at 12:26

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