x86 windows 7 max memory size is 4GB, what is a 32-bit memory patch???? Sounds like a hoax to me.
Sometimes usable is lower if motherboard is sharing video memory. Some motherboards allow usage of more ram, I have seen it countless times. Mac Mini's are the worst culprits, just over 2GB usable, waiting on an update for that...
You can not patch x86 windows into 64 bit. Maybe it changes the displayed usable ram, but it doesn't use it period.