Early 2007 24" iMac iMac6,1 missing?

This list is unfinished/incomplete. Is the early 2007 24" iMac Model iMac6,1 - MA456xx/A just 32bit or 64bit compatible on Snow Leopard?

in Mac OS X v10.6: Macs that use the 64-bit kernel

http://support.apple.com/kb/HT3770

the article indicates which Macs can use or use the 64 bit Kernal by default, but the model numbers are not given in HT1758, it merely refers to post 2008 models.

Mine has a 240 Gb SSD with two terabytes on firewire and 4Gb RAM is it safe to try the 6 and 4 key switch?

I already have issues with the obsolete Nvidea graphics card on Google Earth