Unless you have double sided mem you are kinda fucked. Well, on my board anyway. I can only run single sided in dimm 1 & 2, meaning the booster is in 3 and it it DOES NOT FIT!!! ....unless you take off the heatsinks, and then it gets so damn hot you get errors. (*#%^*(&#^(*@#%$(&^!%!~!@#@#ers!