the alpb uses ram with a latency of 2.5. From crucial.com 'What does "CL" stand for?
CL stands for "CAS latency," which is the number of clock cycles it takes before data starts to flow once a command is received. Low CAS latency is faster than high CAS latency. However, faster memory will NOT necessarily make your system faster. Your computer will only run as fast as the "slowest link" in your system, so you can't speed up your computer by adding memory that is faster than your current memory. The way to make your system faster is to add more megabytes (MB) of memory.'
go there for your ram, it is probably the best out there and you know who makes it. i already got burned by macsales.com, which sent me two sticks of bad ram. went to crucial and have had absolutely no problems.