A moderator of official forums just explained the problem.
It has to do with memory fragmentation that DirectX uses for loading of textures. In 32bit OSes (at least Win) max address space for a process is 2Gb bla bla bla, CoP needs more than that for non-downgraded textures with current size of maps, the problem is solvable if all resources are loaded anew every time player loads a save file, but it will lead to too long loadings. For 64-bit OSes 4Gb of address space is allowed for every 32-bit process, and therefore they allow to use full-sized textures in the game.
it's just quick translation, I have no idea if it does make a sense or not.
There is a way to force full-sized texture to be used on 32-bit OSes however, but stability is not guaranteed:
WinXP (32bit):
execute command line
bootcfg /raw "/3GB /user2500" /A /I
or add following: "/3GB /userva2500" in the boot.ini file
and restart computer
For Windows Vista(32bit)/ Windows7(32bit):
execute command line
bcdedit /set IncreaseUserV2500






Now I wish to know exact requirements.
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(just kiddin')


























