https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900421#M2109 You can use the 2GB memory modules.<BR />However you can't mix modules of different size in a rank/echelon.<BR /><BR />Refer the following document for the details and memory configuration rules.<BR /><BR /><A href="http://docs.hp.com/en/AB297-9001B-en/ch01s01.html#d0e1144" target="_blank">http://docs.hp.com/en/AB297-9001B-en/ch01s01.html#d0e1144</A> Fri, 17 Nov 2006 19:25:48 GMT Sameer_Nirmal 2006-11-17T19:25:48Z https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900419#M2107 Quick question? We have a RX8640 that had individual memory size of 1gb. We bought additional memory modules from HP and now I discover they are 2gb each. Question is? Is it OK/recommended to mix different size memory modules? I call HP and they seem to think its OK.... Fri, 17 Nov 2006 17:33:15 GMT https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900419#M2107 Dan Matlock_1 2006-11-17T17:33:15Z https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900420#M2108 Yes, that is fine.<BR /><BR />Just be sure to follow the rules for installing the RAM.<BR /><BR />The largest size RAM goes in the lowest numbers slots. Then the next largest, etc.<BR /><BR /> Fri, 17 Nov 2006 17:35:22 GMT https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900420#M2108 Patrick Wallek 2006-11-17T17:35:22Z https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900421#M2109 You can use the 2GB memory modules.<BR />However you can't mix modules of different size in a rank/echelon.<BR /><BR />Refer the following document for the details and memory configuration rules.<BR /><BR /><A href="http://docs.hp.com/en/AB297-9001B-en/ch01s01.html#d0e1144" target="_blank">http://docs.hp.com/en/AB297-9001B-en/ch01s01.html#d0e1144</A> Fri, 17 Nov 2006 19:25:48 GMT https://community.hpe.com/t5/integrity-servers/hp-memory/m-p/3900421#M2109 Sameer_Nirmal 2006-11-17T19:25:48Z