Из спецификаций к вашей MB:
http://www.asus.com/product.aspx?P_ID=cr9CeQwu3BN3zCro
Цитата:
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**When installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.
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a256931, а у вас система 32-х разрядная
