Decompose 32-bit Windows 7 can use the lie of 4G memory

These days in many website forums, some people say that 32-bit Windows 7 can recognize 4G memory. Some people say that photos are PS. Some people say that 4G memory cannot be used by Microsoft. Wrong, the younger brother I think is quite interesting, but the intuition tells me that this is impossible.

So, immediately installed a 4G 32-bit Windows 7 to play, and sure enough, in the system properties can display 4G of memory.

But before I read a masterpiece of Mark's translation of the pelvic boss, I believe in the theory, is it that the theory of Windows 7 has been overthrown?

Run msinfo32.exe immediately, Sure enough, it is also 3.25G.

Then use meminfo to see the allocation of the 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 has become the so-called "memory hole" and is occupied by the device

So, the so-called support for 4G memory in 32-bit Windows 7 is only reflected in the ability to identify 4G But only 3.25G can be used.