Greg...My board started out with 4 x 8 =32GB Crucial Ballistix 8GB DDR3- 1866 CL10 of which Crucial guarantees compatibility with the P9X79WS Last week there was a very good sale on these on Amazon Prime so I bought two more DIMMS for a total of six = 48 GB. I want to run a huge RAM drive.

I have installed them in the exact slots as recommended in the Asus manual. The board is running the latest October 10th 2013, 4040 firmware. I see all six DIMMS installed and recognized in the BIOS... but the BIOS only totals up 40 of the 48GB. Windows, likewise, sees only 40GB. I will contact ASUS about this but you don't have any thoughts on why I am missing the 8GB...do you?
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