Bug#709436: debian-installer: too low memory requirement documented on the F2 boot screen
Booting the Wheezy mini.iso, choosing Help from the menu, pressing F2 says:
You must have at least 44 megabytes of RAM to use this Debian installer.
Starting the installer with 64 MB of memory enters low memory mode, and
reports insufficient memory:
[...] At least 86 megabytes of memory are required.
Continuing the installation then runs into OOM situation.
The two memory requirement statements should be synchronized, 44 (or even
64) MB is clearly not enough.