The memory module is required as x8 devices only. The Hynix module HMT31GR7CFR4A-H9 is 2R x4 which is incompatible with Intel 3420 chipset. Please reference the Tested memory list. http://www.supermicro.com.tw/products/motherboard/xeon3000/3400/x8sil.cfm?ipmi=y
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