S3420 RDIMM compatibility? confused!

[JMede]

Hello all,

I have an S3420GP motherboard coming to me with a Xeon 3400-series processor. I admit, I'm having trouble sourcing the RIGHT RAM.

An eBay dealer told me that Samsung M393B5170EH1-CH9Q4 (DDR3 1333Mhz 4GB per stick) would work... but I see that this ram is rated as 2Rx4.

Looking at the clip below from the technical manual, am I reading this correctly? Is the board incompatible with anything that has x4 in the specs? Do I need to look for 2Rx8 modules?

Thanks for your assistance!

James

[idata · Accepted solution]

Memory population rules on S3420GP is kind of complicated.

If you're using a Xeon 3400 series processor, you can use either RDIMM (registered) or UDIMM (unbuffered), but you can't mix RDIMM and UDIMM. If you're using Core i3-500 series or Pentium G6950 processor, only UDIMM is supported. ECC is required for both RDIMM and UDIMM.

Now for RDIMM you can populate all six slots. For UDIMM you can use only four DIMMs, two each channel. # of DIMMs per channel will also affect the DIMM speed. Maximum memory capacity is 32GB RDIMM or 16GB UDIMM. For more details, see the S3420GP http://www.intel.com/support/motherboards/server/s3420gp/sb/CS-030742.htm Technical product specification, section 3.2.

Remember that you can always select memory from the http://www.intel.com/support/motherboards/server/s3420gp/sb/CS-030738.htm Tested memory list.

[idata]

I was wondering if you need further assistance with this matter.