S20 - Installed memory 12.0 GB (7.99 GB usable)

Hi all,
I've just installed 12 GB of memory, but Windows 7 reports only 7.99 as being usable. Things I've tried so far:
Checked the BIOS for an 'extended memory' option
Checked msconfig to ensure there is no limit on memory specified.
Googling around for a solution various posts have suggested a BIOS update or changing the RAM timings. The RAM is all the same kind - 2GB DDR3 PC 10600 ECC.
Any suggestions would be welcome!
Thanks.
Solved!
Go to Solution.

We've seen some issues like this with customers installing their own memory.  You really need to pay careful attention to ensure each DIMM seats correctly.  If it feels funky when installing the DIMM, pull it and reseat it to be sure.  Also make sure each latch is fully engaged and they are all aligned when you're done.
Also, for best performance, make sure you're using the correct "fill pattern".  You should populate DIMMs in order (slot 1, then slot 2, then slot 3, etc.), but be mindful to note that the DIMMs aren't ordered sequentially on the board.  If you follow the labeling on the board and on the cover label, you should be fine.  Let me know if you have any questions.

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