Physical Memory Installed on Big-IP 1500?

What is the recommended way to see how much physical memory is actually installed on a Big-IP 1500?

 

 

I have tried the following and all show different numbers:

 

 

1. after i ssh into the box type, "bigpipe memory show"

 

2. after i ssh into the box type, "free"

 

3. looking at the LCD on the front of the box.

 

 

Which one is accurate?

 

 

Does the LCD show more than just the physical memory installed?