In which usage scenario’s are Intel’s offerings less compelling? The Nehalem-EX is a powerful platform, but it is also a completely different one than the “Westmere EP” platform. The Nehalem-EX's most important market is the 4-socket/8-socket x86 market, where about 400,000 servers are sold per year, or about 5% of the total x86 server market. It is also a pretty complex platform with two I/O hubs and 16 (!) memory buffers chips on a 4-socket board. The Nehalem EX platform does not only want to conquer the high end 4 and 8-socket x86 server market, it also wants to convince the more paranoid RISC and Itanium buyers:
AMD uses the same building blocks for it’s midrange 4-socket platform as it does for the high-end 2-socket platform and calls it the G34 infrastructure. The consequence is that the RAS features stay the same, and as a result, AMD can not completely compete with the Nehalem EX platform when it comes to RAS. But that is not really a problem, as some of the "high-end" RAS features aren't used by 98% of the x86 crowd who buy the more expensive 2-socket and 4-socket servers. To compete with the 8 core/16 thread Nehalem EX, AMD puts two DDR3 Istanbuls together, which communicate via a hypertransport link and calls it a twelve core Opteron 6100 (Socket G34). A server based on the Opteron 6100 can probably come close to the performance of the lower-end and midrange Nehalem EX, but it is a lot cheaper to design and produce. The disadvantage is that it only has 12 DIMM slots per CPU, while the Nehalem EX has 16 DIMM slots per CPU.
Our first impression is that AMD will find it hard to win the high end database and ERP market. The quadcore Nehalem 5500 already outperforms the six-core Opteron “Istanbul” by a large margin (30-50%). The Opteron 6100 also has 50% more cores, but it is likely that a “native octalcore” will scale a bit better than a two times 6-core design. For the virtualization market, the higher amount of DIMM slots are an advantage for the Nehalem EX. At first sight, it looks like it will be pretty tough for AMD to regain market share in this part of the server market.