Good Evening, I am running on a 2 year old TiBook, of the final revision before they moved on to Aluminum. It is definitely showing its age and im trying to milk all the performace I can out of it. After extensive research, I chose to purchase a 512mb chip from a manufacturer that has "Apple Certified" emblazoned on the RAM site. Sadly the RAM causes what I believe to be kernel panics and freezes when paired with the 256mb PC133 chip that came with the TiBook. I RMAed the chip thinking it to be faulty, and have recieved another 512 chip...the problem persists. Running the 512mb alone, w/o the 256mb is more stable but will cause usually stable apps to crash, including widgets...so its not reliable. I was thinking, could it be caused by a CAS Latency conflict, the Apple 256mb is CL3 and this new chip is CL2 or 2.5. If thats a possible problem, should i just find a CL3 chip elsewhere? Other than that, I am at a loss as to what might be causing it, and both 512mb chips I have recieved can't be bad. Is this ailment fixable, or should I fork over my arm for a $150 chip from Apple? Thanks in advance.