Dear all, i have KHX24C11T3K2/8X 8gb kit of 2 in my PC, now I want to upgrade ram memory, can i just buy new version of HX324C11T3K2/8 8gb kit of 2? I`m worry about collision of older and new memory kit :( is it safe to use those two kits? just don't want do throw money for nothing if you...