Can I install a 4gb and 8gb ram on the same computer. I installed both the two 4gb and 8gb ram sticks on my computer and windows recognized 16gb. Couple months pass and my motherboard gets fried. The technician i paid to diagnosed my computer said that my 2 4gb and 8gb ram setup doesn't work even though windows recognized 16gb. I want to know whether i should just keep the 2 4gb sticks or install the 8gb with the 2 4gb sticks and if the installation of the 4gb and 8gb ram sticks could have lead to my motherboard being fried.