Me too. I ordered one regular size 256K from OWC and one low profile for the lower slot. When it arrived, the low profile had 8 chips, and the pair didn't work. However each chip worked by itself and was recognized for a full 256K, so I exchanged the regular module for another low profile one, and it works! OWC must have something special in those Wallstreet 256K low profile sticks. I have some other 256K 8-chippers for a ThinkPad, and they don't work at all in Wally.