Other than the price difference of about $8, I was wondering what the difference between the two RAM types in the title are. I am currently using KHX1600C9D3K2/8G and was trying to upgrade using KHX1600C9D3K2/8GX. After installing the new RAM my computer just restarted continuously. After changing out the sticks back to my old ones it worked just fine.
KHX1600C9D3K2/8G (http://www.amazon.com/dp/B004JO7CZO)
KHX1600C9D3K2/8GX (http://www.amazon.com/dp/B0037TO5C0)
KHX1600C9D3K2/8G (http://www.amazon.com/dp/B004JO7CZO)
KHX1600C9D3K2/8GX (http://www.amazon.com/dp/B0037TO5C0)