I ask that question because when i tried to transfer 4GB file, i get an error logged which says:

2013/08/01 10:02:57 [error] 50935#0: *27 client intended to send too large body:
4582367864 bytes, client: y.y.y.y, server: sx1, request: "PUT /core_8GB.nz HTTP/1.1", host: "x.x.x.x"..