Heap size fails if set to 1400

Hi,
I have a machine that has 4 gigs of memory, runs x64 and have java 1.5.
Now when i run my program i would like to have as much memory as possible, so maybe around 2.5 gig, but the max i can set it to is 1350. I use this command:
java -Xmx1350M -Xms1350 program..
So two questions, how can i set to a larger amount and secondly why is it failing at 1350?
Thanks
Erik

java -Xmx1350M -Xms1350 program..And even at that, you'll have severe non-heap memory problems. About 1300M is the highest safe value that still gives you lots of room for thread stacks, etc.
So two questions, how can i set to a larger amountCannot on Windows - not by default. Unless you're running a 64-bit Windows. Or unless you run Windows with some special options.
See http://dev2dev.bea.com/blog/hstahl/archive/2005/12/how_to_get_almo.html
and
http://www.theserverside.com/blogs/thread.tss?thread_id=37952
and secondly why is it failing at 1350?Because of the Windows lays out its DLLs in the address space for the process. Each process is normally limited to at most 2GB of memory, and that is further reduced by the placement of DLLs - Java needs a contiguous space for its heap, so one wrongly placed DLL can fragment the area and limit your memory size.

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