I am currently try to upgrade my computers memory, i had two sticks of 512 ddr2 and i bought two 1g sticks of ddr2 to install, when i try to boot i found that the two i bought are non ecc and the two i had are ecc, my computer will not run both or mix them is there any way i can turn the ecc off on my original two sticks? or any way to mix them? i need to know asap.