Memory allocation testing between two devices

I am testing my app i开发者_开发知识库n two different devices. My app is relies heavily on images(allocating and deallocating). I know I have a leak but I am just curious why I observe this.

The behavior between the two devices is different. Device A crashes after 4 cycles of switching between views and Device B after 10 cycles, yet Device A has more free memory than Device B.

             Device A:               Device B:
Type         iPhone 3G 16GB          iPhone 3G 8GB
Capacity     14.64GB                 7.08GB
Audio        5.32GB                  1.18GB
Video        48.8GB                  -
Photos       267.3GB                 46.8GB
Apps         1.08GB                  505.5MB
Other        343.9MB                 370.7MB

Free         7.60GB                  5.0GB

Any insights why this is the case?

I am not sure if I understand this correctly, but the figures on the last row (7.6/5 GB) refer to available flash memory, not to the RAM. Therefore they say nothing about the expected performance of a memory-intensive application. Neither the amount of free RAM is exactly telling, because the system will start killing large applications when the memory is scarce and the amount of free memory will go up.