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Please refer to page 23 of Technical Product Specification for Intel® Server Board S3420GP Family.
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Checking on previous Intel® Communities I found the memory that other users have used on this server in order to get the maximum of 32 GB of RAM to work. Please refer to S3420GP and RAM
According to Technical Product Specification(TPS), the Memory specifications for achieving the maximum Memory of 32GB on this board should be listed as follows:
However, on the Quad Rank RDIMMs section, there is a correction to be made under 2Gb DRAM Technology column which is 32GB (8x 8GB RDIMMs).
Other customers have tested 4 x 8GB modules of Kingston PC3-8500 1066MHZ and they worked successfully. You could refer to S3420GP and RAM
This is the memory they tested: http://www.amazon.de/gp/product/B002O3FLZU/ref=oh_details_o03_s00_i00 and reported to be working fine.
Please let me know if you have any questions.