This new line of Opterons sports the ability to use unbuffered memory & a 939 socket. The rest of the Opteron line will continue on the S940 & require registered ECC DIMMs.

" Sun Microsystems, Inc., the first to use the new AMD Opteron 100 Series with ECC unbuffered memory support, recently, announced the Sun Ultra 20 Workstation, based on the new processors. The Sun Ultra 20 Workstation entered the marketplace with a new world record result on OCUS benchmark, a performance measurement of graphics oriented MCAD application - Pro/ENGINEER—based on results published at http://www.proesite.com, as of June 27, 2005."