On Intel's ARK page there's no specification for maximum supported memory on the Core 2 Quad Q9400. I'm adding 2x2GB to my existing 6GB 2-1-2-1 layout and removing the 2x1 sticks, but I have quad channel so I wanted to go with 16GB because having the Fallout 4 creation kit and Fallout 4 running at the same time (I'm a modder) on only 8GB is near impossible. I looked at the Dell website for my motherboard and it said that my machine came with up to 8GB but it doesn't specify the macimum amount of supported memory. I understand that I can upgrade my motherboard but I can't find a cheap LGA 775 motherboard with quad channel DDR3 specifically on Amazon.