I have an Aurora I bought in 2011. Motherboard is Alienware model 04VWF2 X58, BIOS A11, CPU 17 930 1366 LGA. Running Windows 7 Pro. I thought my max memory was 24 gigs, but when I recently upgraded, the MB and OS will only see 16. Is this a limitation of the motherboard? Or is there a away I can get it to see the max memory? BTW, when I run CPU-Z, it sees the entire 24 gigs. 

I need it because I run several VM's at once for the work I do.