Description: My esxi host has 4x 2GB = 8GB memory and I decided to replace 2 x2GB sticks with 2x4GB sticks making total of (2x2GB + 2x $GB) = 12GB. However, this whole thing caused a grief for me.

My esxi host booted up fine and it shows 12GB of memory and every thing was great. However, as soon as I started windows server 2003 and windows 2008 based VMs I see BSoD. See the picture attached.

Few key points to note:

1) I have 3 VMs. One windows 2003 and two windows 2008 based.

2) VMs I have seen the issue are on the same DATA Store.

3) If I only start any 1 VM out of 3, it boots up fine.

4) As soon as I try to boot any of the remaining two, I see the BSoD on the VM which was already up and running. I have never seen BSoD if windows was up and running. I have always seen it during the booting of the windows but not if windows was up and running.

5) Please find the screen shot of BDoD.

Please help!