HOW SETING ALLOWED MEMORY ?

I DONT ENDERSTAND SOMETHING?

my ArmA.cfg

<table border="0" align="center" width="95%" cellpadding="0" cellspacing="0"><tr><td>Code Sample </td></tr><tr><td id="CODE">anguage="English";

adapter=-1;

3D_Performance=6849.000000;

Resolution_W=1024;

Resolution_H=768;

Resolution_Bpp=32;

refresh=60;

FSAA=2;

HDRPrecision=8;

lastDeviceId="4318,665,26939432";

localVRAM=520613888;

nonlocalVRAM=394264575;

I'v 2GO memory whith VC 7900 GO GTX 512mo

and when i try to change nonlocalVRAM that change nothing

How setting memory allowed for Arma ?

i v read but loose the post use in launcher -maxmemory=XXX

or we cant change this value and use only 400mo of memory?