According to the spec sheets, the maximum memory you can install into an Optiplex 390 is 8 GB. Can anyone tell me why that is? I thought the chipset in this computer would support 2 x 8 GB dimms? Is that just old information, or is there really a 2 x 4GB maximum? Why would that be?
Both Crucial and the spec sheet for the Opti 390 say 8GB (2x4GB). Of course, you're welcome to try 2x8GB and let us know if it works.
Please post back and let me know if you need more help.