I have GA-P55-UD3L motherboard , 4GB DDR3 ram ( seperated in 2 channels , 2GB per channel ) . Windows 7 says that i have 2gb hardware reserved memory and i can use only 2 gb . I checked the Bios and says that i have only 2 GB usable , but i can see the other 2 GB in the second channel in the memory section of Bios . What can i do ?