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A simple history
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I have my GA-X58A-UD5 running fine with 3 * 2Gb
I add new pack with 3 * 2Gb memory
And .. And ... I have 12Go detected and only 10Gb running
I test , i remove old pack at this time 4Go for 6Gb memory
Finnally found problem
1 - i add only one new memory in the first white slot --> fine 2Gb OK --> OS start
2 - i change this by a new --> fine 2Gb OK --> OS start
3 - i change with the thirty -->bad --> BIOS stop to C1
I am stupid i have not tested the 3 separatly !!
If this can help many friends
Pierre