Hi, Clearly there are less expensive options for RAM than buying directly from Apple (and found several helpful threads here). However, Apple seems to have a fairly stern warning about using RAM from elsewhere for the new Mac Pros...would appreciate your views. Many thanks, G here's what Apple says about RAM for the new Mac Pros: "Because accessing data from memory is much faster than accessing data from the hard drive, the more memory your system has, the faster it can manipulate your data, resulting in greater application performance especially when working with large files and memory-intensive applications, such as graphics, audio, video, and scientific applications. The Mac Pro now uses faster 800MHz DDR2 fully buffered ECC memory, an industry-standard memory technology that allows for more memory capacity, greater bandwidth, and better reliability. To take full advantage of the 256-bit-wide memory architecture, four or more FB-DIMMs should be installed in the Mac Pro. Please note: Apple created a more robust thermal specification for the Mac Pro FB-DIMM heat sinks that provide more efficient cooling than many other FB-DIMMs. These FB-DIMMs require less airflow to stay cool and allow the internal fans to spin at slower speeds, improving system acoustics. FB-DIMMs made by other manufacturers that do not include a sufficient heat sink may cause the fans to run faster (and louder) or the memory chips to run slower so as not to overheat."