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We have 4x R410 servers and looking at upgrading RAM in all of those. We've started with one and can't figure out why the memory is being clocked down.

Old setup:
Dual CPU Intel Xeon L5520
Bank 1: 2x PC3-10660 4GB @ 1333 MHz
Bank 2: 2x PC3-10660 4GB @ 1333 MHz
Bank 3: 2x PC3-10660 4GB @ 1333 MHz
Bank 4: Empty

New setup:
Dual CPU Intel Xeon L5520
Bank 1: 2x PC3-10660 16GB @ 1066 MHz
Bank 2: 2x PC3-10660 16GB @ 1066 MHz
Bank 3: 2x PC3-10660 16GB @ 1066 MHz
Bank 4: Empty

The server documentation and the updated memory sheet from Dell states that in Optimizer mode, in dual-CPU scenario, the new setup should run at nominal 1333 MHz speed. The new RAM modules are: Kingston KTD-E313LV/16G, and provided by MrMemory as compatible upgrade. I believe these are correct dual-rank modules, as designated by 2Rx4 PC3L.

Would anyone be able to offer some advice or maybe would have an idea why these would be clocked-down?

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It's because the integrated memory controller on your CPU does not support 1333MHz. It only supports DDR3 800/1066.

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  • So the old setup was always running at 1066 MHz... Should have checked the CPU specs really but for some reason I believed we were running the memory at full speed. Thanks for pointing me in the right direction! Jun 9, 2015 at 7:40

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