S3420GPLC Memory Configuration

[idata]

I recently decided to buy an extra 8GB of DDR3 1333 memory (2x 4GB) to make it a total of 16GB. I inserted the new memory so all of the A slots are filled and 1 of the B slots are filled. It does work but it will not run at 1333MHz but 800MHz. There are no options in the bios to change this so can someone help me?

[Edward_Z_Intel]

Memory population rules on this board is kind of complex. Memory working frequency is defined by following factors:

1. Number of DIMMs on a channel. Only one DPC (DIMM Per Channel) may work at 1333MHz.

2. Organization of the DIMM. A single Quad-Rank DIMM on a channel is limited to 1066MHz.

3. The speed of the processors Integrated Memory Controller. Check your processor on http://ark.intel.com http://ark.intel.com and see if 1333MHz memory is supported.

The rules above (and more) are documented in http://www.intel.com/support/motherboards/server/s3420gp/sb/CS-030742.htm S3420GP TPS, section 3.2.4. An easier way is to download and run the http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=17625&keyword=%22memory+configuration+tool%22&lang=eng Intel Memory Configuration Tool, and see what kind of memory configuration meets your requirements.