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I recently purchased some servers to host our ESX environment for a client. We went with the X5550 processors. Be careful of how you purchase the memory cause the more you buy the slower it is.
Basically the server has 3 channels with 1 CPU and 6 channels with 2 CPUs. Each channel has 3 slots for a total of 18 slots with 2 CPUs. If you populate 1 slot per channel you can run at 1333 MHz. If you put in one more memory chip in a channel, you run at 1066. One more and you go down to 800 MHz.
The 8 GB DIMMs do not run at 1333 so basically if you want to run at that speed you can only have 24 GB of memory. Here is the table:
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You raise some great points. Like you say, you need to select your processor and memory carefully when using the Xeon 5500.
There are two different 8GB DIMMs available for the DL380 G6. One ("8GB 2Rx4 PC3-8500R-7") has a max speed of 1066MHz; the other ("8GB 2Rx4 PC3-10600R-9") can run at 1333MHz.
When using one of the Xeon 5500 processors that starts with an X model number, most HP G6 servers will let you run 2 DIMMs per channel at 1333MHz. HP did extra work to support this boost, which means you can actually get up to 96GB running at 1333MHz. (There's a BIOS setting in HP's in ROM BIOS Setup Utility you need to set to enable this.)
There's an updated version of the chart you posted available, which notes this additional capability.
More info on memory rules here.
There's also an online tool to help guide memory configuration here.
Disclaimer: I work for HP.
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