The Sun Fire X2200 M2, available this week at a starting price of $1,595, accommodates two Rev F Opteron processors and 32GB of memory. It's 1.75 inches thick.
An M2 version of the single-processor Sun Fire X2100 is also available. It updates a model introduced last fall with the Rev F dual-core Opteron processors. That means the system will accommmodate an upgrade to quad-core Opterons coming in 2007. Its starting price is $945.