Useable memory

[josh93]

I have windows 7 64 bit with 8gb installed memory. but it says that only 3.18 gb is useable. can make more of the memory useable and if so how do i do it?
thanks

 

[marcellis22]

What motherboard do you have? Company, model, REV#...

 

[josh93]

asrock P55 extreme
on the windows base scores it says that 8gb is installed but only 3.18 is useable

 

[marcellis22]

The board supports 16gb, what version of Win 7 are you running?

 

[josh93]

i am runing the home premium 64 bit version