While J12B2-M pins 1,2,3 are clear (1-2: 50 ns memory, and 2-3: 60 ns memory), J12B2-M pins 4,5,6 are listed as "reserved". The manual states, "The jumper on pins 4-5 is reserved. Do not change it." However, on my motherboard and on all motherboard images I could locate online, the jumper is on pins 5-6 rather than 4-5. This apparently was a typo and noted in the errata. However, nowhere was the jumper setting explained. It most likely alters some memory timings. Does anybody know what this jumper setting is for? Thanks.