Yes, all these "1GB" versions of new cards (now that memory is so cheap, why don't OEMs just make 2GB cards?) are essentially designed for peeps with 32-bit systems.
I gained and extra 4GB of memory space, (on an 8GB 32-bit system giving me access to just 3.5GB) by installing a gigabyte iRAM system and putting the pagefile on it. Windows is executed with the /PAE option.
... some things in life just drive you bonkers. Especially the rubbish you see in forum posts