Hello there
I found a handy way to increase memory usage in the stalker game and has seemed to help the larger mods as well, i have Newsa using 3.8g of my 4 g of memory since this little tweak
Download NTcore from here
http://www.ntcore.com/exsuite.php and install it. What you do then is right click your stalker exe usualy XR_3DA.exe then click on open with CFF Explorer. Click on file header then click on the part that says click here. Now tick the box that says (app can handle >2g address space), click ok then save it somewhere then copy and paste it inplace of stalker exe then reboot the machine. I am using windows 7 and from what i have read it helps alot of games doing that as well as stalker, like Railroads, oblivion etc
I have posted 2 screenshots of what i mean to incease memory usage
Afer you right click stalker and open with CFF
http://i476.photobucket.com/albums/rr127/Ultradad2008/pictureone.pngWhen you click file heade and then click on click here you will see this
http://i476.photobucket.com/albums/rr127/Ultradad2008/picture2.pngAnd a picture of memory usage
http://i476.photobucket.com/albums/rr127/Ultradad2008/Memoeyusage37g.jpgI also increased my memory usage for game through BGCedit and followed the instuctions there, here is the link
http://www.sevenforums.com/tutorials/2676-bcdedit-how-use.html. I did this mainly for Sid Meilers Railroads and had no more crashes and have changed the exe of all games i play for max memory usage, i hope it helps you guys out as well
Here is a better link that goes into more detail on what to do
http://www.nvnews.net/vbulletin/showthread.php?t=89138, hope this is more helpful
Ps dont foget if using BGCedit right click console and use as admin or it wont change the values