I posted this bellow but realized it should go here.
Anandtech.com provides much more knowledgeable and professional reviews. They had this to about AMD's new chip,
"Unfortunately, with the current power management in ESXi, we are not satisfied with the Performance/watt ratio of the Opteron 6276. The Xeon needs up to 25% less energy and performs slightly better. So if performance/watt is your first priority, we think the current Xeons are your best option. The Opteron 6276 offers a better performance per dollar ratio. It delivers the performance of $1000 Xeon (X5650) at $800. Add to this that the G34 based servers are typically less expensive than their Intel LGA 1366 counterparts and the price bonus for the new Opteron grows. If performance/dollar is your first priority, we think the Opteron 6276 is an attractive alternative."
http://www.anandtech.com/show/5058/amds-opteron-interlagos-6200/1 I don't understand why other sites are more popular.