So, i'm trying to maximize the ram on my old optiplex 990 system, and the maximum ram allowed is 32 gb. How much can each slot handle and what type do I need? I have 2 sticks of these right now https://www.amazon.com/Samsung-PC3-10600-DDR3-1333MHz-Unbuffered-M378B5273BH1-CH9/dp/B00DIVZJKO/ref=sr_1_4?crid=DBC3RVRQCP8W&keywords=Samsung+4GB+PC3-10600+DDR3-+1333MHz+non-ECC+Unbuffered+CL9&qid=1663480666&sprefix=samsung+4gb+pc3-10600+ddr3-+1333mhz+non-ecc+unbuffered+cl9,aps,73&sr=8-4