How can I determine the RAM in RP?

[chibcharus]

I have both a 256 and a 512 RP. When I use "free -h" I get the same information for both. This info appears to indicate that there is only 256 M total memory. How can I tell the difference?

[rpdom]

You could add together the output of the vcgencmd get_mem commands like this

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rpdom@raspi1: ~ vcgencmd get_mem arm
arm=160M
rpdom@raspi1:~$ vcgencmd get_mem gpu
gpu=96M

160 + 96 = 256 (Model B V1.0)
rpdom@raspi3 ~ $ vcgencmd get_mem arm
arm=448M
rpdom@raspi3 ~ $ vcgencmd get_mem gpu
gpu=64M

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228 + 64 = 512 (Model B+)

The "free" command will only show the memory allocated to the ARM CPU, not any reserved for the GPU.