RAM memory on 32/64 bit Ubuntu

[ssdx32]

im running two different os (ubuntu 10.10), 1 is 32, the other is 64-bit, both with 8GB RAM (both OS on different hard drives)
the 32 shows 8063 MB RAM, 64 shows 7993 MB
why is that?

[Michael]

When running not as root on Linux, the only way the Phoronix Test Suite can determine your RAM capacity is simply to see what's available, which is a slightly lower amount than your total physical RAM capacity (8GB in your case) and can be different between 32 and 64 bit kernel.