Sorry, I was sleepy and misread "redundant" as "independent" and ASSuMEd that your 5260 shared the same type of MoBo as my 6360. :IIndeed. The 5260 uses a SIMM.OOPS! Shoulda' mentioned that it's a DIMM module up front! That's why the signals on the two sides are independent of the opposite side.
Way too many model names/numeric designations and far too many RoadApples in that era of Desktops & AIOs for my old noggin' to keep straight! :-x