When I was attending VMworld in September, one of the most frequently asked question was “how do I decide whether to use 2P Intel Xeon 5500 processor-based servers or 4P Six-Core AMD Opteron^TM processor-based servers for virtualization?” Over the past few weeks I have done a lot of research and put together a solid picture of where a 4P server can provide an amazing amount of value and efficiency.

Low and behold – I was not the only person working on this thought thread. We recently sent Johan De Gelas with AnandTech a 4P Six-Core AMD Opteron processor-based system.  And in his review, “Expensive Quad Sockets vs. Ubiquitous Dual Sockets,” Johan focuses on some interesting points on the same topic (which my colleague John Fruehe discusses on the @Work blog as well). While he compares a number of workloads on 2P servers versus 4P servers- my interest was drawn to the section where Johan discusses one of my most favorite topics – virtualization (surprise, surprise).

In my research I have been taking a look at the pricing of 2P and 4P servers with larger memory configurations. Here is a snapshot of system costs using processors with similar specifications. Note how steeply the system price climbs for the 2P servers as the memory configurations grow.

Johan came to a similar conclusion  ”A very large database or virtualization consolidation scenario requiring more than 72GB of RAM will probably push you towards the quad Istanbul – once you need more than 64-72GB, memory gets really expensive on the Intel dual socket platform. There are two reasons for this: 8GB DIMMs are five times more expensive than 4GB DIMMs, and DDR3 is still more costly than DDR2 (especially in large DIMMs).”

OK – this is a compelling cost message. But what about performance? Johan gives two examples of performance – current VMmark scores with systems that have memory configurations ranging from 64GB to 128GB, and vApus Mark I, their own in-house developed virtualization benchmark, designed to measure the performance of “heavy” performance-critical applications and done in cooperation with the Sizing Servers Lab.

For performance details, latest results, and system configurations see http://www.vmware.com/products/vmmark/results.html.

So compelling performance - and more importantly – very compelling price/performance.

I did one other exercise during my research. Instead of just comparing server to server – I took a look at comparing a 42U rack of 2P servers versus a 42U rack of 4P servers. Using the system costs from the example above here is another snap shot

The price difference of servers to fill a 42U rack is less than $10,000 when comparing 2P and 4P servers with 64GB of RAM – and over $400,000 more for 2P with 128GB of RAM compared to similarly configured 4P servers.

So the take away from my research – 4P servers running Six Core AMD Opteron processors provide the cores, memory and price to achieve simply spectacular virtualization! And, as I noted, to get some additional insights on the same topic, check out my colleague John Fruehe’s recent blog “AMD Opteron Processor – Delivering True Value, Not Just Benchmarks.”

Margaret Lewis (@margaretjlewis) is a Product Marketing Director at AMD.

 Her postings are her own opinions and may not represent AMD’s positions, strategies or opinions. Links to third party sites are provided for convenience and unless explicitly stated, AMD is not responsible for the contents of such linked sites and no endorsement is implied.