AMD has released a range of quad-core, 8-core, 12-core and 16-core processors featuring its second-generation 'Piledriver' modular core architecture which are designed as a drop-in replacement for 'Bulldozer' Opteron parts.
I experienced core dumps (Illegal Instruction) on 2 new Opteron 2-way 6274 systems while using XEN 4.1.2.
I could make following observations in different configurations:
2x Opteron 6274: Ubuntu Precise w/o XEN = WORKING
2x Opteron 6274: Ubuntu Precise + XEN 4.1.2 = NOT working
2x Opteron 6274: Ubuntu Oneiric + XEN 4.1.1 = WORKING
2x Opteron 6274: Fedora 16 + XEN 4.1.2 + Kernel 3.1 = WORK
I have numerous dual Opteron 248's, single core, running in 64-bit mode with CentOS 6.x. I would like to purchases some of the many chips on eBay that are Opteron 275's, dual core, that are said by the manual to be part of the 200 series although the voltages are higher. My goal is a faster server with more memory. The 275's can handle DDR400.