Hello,

I have a good and working Optiplex 990 with 16GB RAM.

The Ram sticks consists of 2X4GB and 2X8GB.

I bought 2 new 8GB RAM sticks from Kingston and added to the PC - Kingston ValueRAM 8GB DDR3 1600Mhz CL11.

In the first startup the bios alerts on Memory change, so I enter the Bios to verify that all 32GB ram are recognized by the Bios and all 32 GB ram is present.

Then I exit the Bios, the PC reboots and I see another alert that the RAM was changed. I enter the second time to the Bios and I see that only 16GB is recognized.

I removed the old RAM to check the new RAM and they all work and recognized by BIOS and Windows. I removed the new RAM and installed the old RAM and all is OK.

I re added only 3 x 8GB ram (2 old RAM sticks and 1 new RAM stick) and all 24GB is recognized by BIOS and Windows.

I tried with Bios Revision A23 and Bios Revision A24, both did not work.

Your help is much appreciated.

Best regards,

Michael