Decomposing 32-bit Windows 7 can use 4G memory lie

These days in many website forums, some people say that 32-bit Windows 7 can recognize 4G memory, some people said that the photo is PS, some people can not use 4G Memory is Microsoft's fault, the younger brother I think is quite interesting, but the intuition tells me that this is impossible.
I care, immediately installed a 4G 32-bit Windows 7 to play, and sure enough, in the system properties can display 4G of memory.
But before reading a masterpiece of Mark's translation of the pelvic boss, convinced the theory, is it that the theory of Windows 7 has been overthrown?
Run msinfo32.exe immediately, and sure enough, it is 3.25 G.
Reuse meminfo to see the allocation of physical address, the display is also 3.25G
Sure enough, it seems that there is only one truth, then go to the device manager 瞧瞧
CFF70000 to FFFFFFFF this memory is The so-called "memory hole" is occupied by the device. Therefore, the so-called support for 4G memory in 32-bit Windows 7 is only reflected in the ability to recognize 4G, but only 3.25G.