[opensuse] Questions on 32-bit v. 64-bit

Hi guys,

When I install openSUSE, how does it know whether it should install a
32-bit kernel or a 64-bit kernel?

Does any part of the installation reflect that?

The complication arises when the system originally has 2GB RAM but
will later on be increased to 8GB RAM.

If the installed kernel had been 32-bit, is it possible to upgrade the
whole installation to 64-bit to support the increase in RAM?

Let's take for example the Xeon 5130 processor.
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