The major differences between the G33 and the G35 are the IGP and the southbridge, along with DDR3 support from the G33. Also, besides the differences on IGP hardware, they both have similar HD-content.
The thing is, DDR3 support for G33 is a moot point for now. No manufacturer will build a DDR3-ready board based on G33, they will use P35 instead. And of course NO mATX DDR3 board will appear for now.
As for the southbridges, they both have the same core abilities, and their performances are actually not that far apart.
So, while tecnically the G33/ICH9 combo is a better performer on paper (except for the IGP), in real life that might just not be the case.
For a more reliable source of info on those chipsets, check
here and
here, please. Wikipedia is not that good...
As for BSEL, I think it means "Bus Select", but I'm not 100% sure. You could try a Intel hardware manual design guide or something (available online), those will probably have it...
Cheers.
Miguel
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