Win 7 and ram

32bit can only address 4 gigs of memory (with included all of it not just ram) so will only have enough addresses left over after VRAM and system addresses for about 3-3.5 gigs for ram.

If you want to use more you need to use the 64bit version.
 
Windows 7 32 bit will be fine recognising 8 megabytes of RAM.

8 Gigabytes however will be problematic due to the 4GB address limit 32-bit systems. So You'd only have about 3GB usable RAM.

Happily, retail licenses (and OEM i believe) for windows 7 will work with both 32-bit and 64-bit installations, so all you need to do is get the 64-bit installation media and you're happy :D
 
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I think (hope) you mean GB now MB :p You usually see 3.25-4GB available, I think your VRAM counts towards the 4GB cap.
 
Here is it explained. By definition, a 32bit processor uses 32bits to refer to the location of each byte of memory. 2^32 = 4.2 billion, which means a memory address that's 32bits long can only refer to 4.2 billion unique locations (i.e. 4GB).
Hope that helps! Why not go for a 64bit OS?
 
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