https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688557#M6804 Memory in the RX5670 is replaced in Quads. All DIMMs in the quad must be the same size. Check the Installing Memory section of the manual at this link: <A href="http://forums11.itrc.hp.com/service/forums/postanswer.do?threadid=1448374&amp;forumId=1&amp;closedFlag=0" target="_blank">http://forums11.itrc.hp.com/service/forums/postanswer.do?threadid=1448374&amp;forumId=1&amp;closedFlag=0</A><BR /><BR />Ron Tue, 21 Sep 2010 20:54:58 GMT Ron Kruger 2010-09-21T20:54:58Z https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688556#M6803 My memory rx5670 with 2GB (4x256MB) PC2100 ECC REG have an Error,Can I replacement with 1 GB (1x 1 GHz) PC2100 ECC REG in only one slot memory ? Mon, 20 Sep 2010 04:09:27 GMT https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688556#M6803 ndra 2010-09-20T04:09:27Z https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688557#M6804 Memory in the RX5670 is replaced in Quads. All DIMMs in the quad must be the same size. Check the Installing Memory section of the manual at this link: <A href="http://forums11.itrc.hp.com/service/forums/postanswer.do?threadid=1448374&amp;forumId=1&amp;closedFlag=0" target="_blank">http://forums11.itrc.hp.com/service/forums/postanswer.do?threadid=1448374&amp;forumId=1&amp;closedFlag=0</A><BR /><BR />Ron Tue, 21 Sep 2010 20:54:58 GMT https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688557#M6804 Ron Kruger 2010-09-21T20:54:58Z https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688558#M6805 Sorry, that is a bad link. Try this one: <A href="http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01875438/c01875438.pdf" target="_blank">http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01875438/c01875438.pdf</A><BR /><BR />Ron Tue, 21 Sep 2010 20:57:00 GMT https://community.hpe.com/t5/integrity-servers/replacing-memory/m-p/4688558#M6805 Ron Kruger 2010-09-21T20:57:00Z