It seems I have a little technical issue. I have an ASRock P55 Extreme and with 2 I7 memory kits ( 2 modules from 3 ), at BCLK 200MHz, the system is fully stable there is no problem, no errors at all, but with 2 I5 memory kits I have tested so far ( Mushkin and Patriot ), one 1600MHz and one 2000MHz, I see in BIOS, in Vista x64 System Properties 4GB RAM installed and in Task manager only 2GB usable.
What could be the problem?
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