I wrote a review a while back about my experience with the HP N40L and I promised that I would write back about the 16GB memory upgrade that I was going to do. On the HP site, the maximum capacity for memory was reported at 8GB, however users all over the web tried and tested adding 16GB of memory to their N40L server with success. Today I tested with CORSAIR XMS3 8GB 240-Pin DDR3 SDRAM DDR3 1333 Desktop Memory Model CMX8GX3M1A1333C9 and I am happy to report that I was also able to successfully get the N40L to recognize the 16GB total as you can see per the image below.
I had read that some users were experiencing sporadic issues with memory detection upon reboots where only 8GB of 16GB would be detected. I personally rebooted the server a few times myself and did not experience any issues which makes really happy. So if you are going to be buying this memory for the N40L, please do so at your own discretion.
Hope this helps anyone that is looking for a sweet upgrade!