Very nice article. You did address power issues obliquely when talking about DDR3, but I'm surprised you didn't mention the power drawbacks of FB-DIMM. The fast shift register on each DIMM requires a few watts more than a standard DDR2 module. And when you add more DIMMs to an FB-DIMM system, all memory access becomes slower, not just access to DIMMs at the end of chains. For example on a particular system I have here memory performance is best with 4 FB-DIMMs and a bit slower with 8.
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