[pfSense] different builds and versions

[Guruprasad R]

Can someone explain or provide me the link on explanation of different
builds available for download. 

- 	 
[ ]	pfSense-2.0-RC3-4g-amd64-20110621-1841-nanobsd.img.gz
22-Jun-2011 19:18 	153M	 
[ ]	pfSense-2.0-RC3-2g-amd64-20110621-1841-nanobsd.img.gz
22-Jun-2011 19:18 	149M	 
[ ]	pfSense-2.0-RC3-1g-amd64-20110621-1841-nanobsd.img.gz
22-Jun-2011 19:18 	148M	 
[ ]	pfSense-2.0-RC3-512mb-amd64-20110621-1841-nanobsd.img.gz
22-Jun-2011 19:19 	147M	 
[ ]	pfSense-2.0-RC3-4g-i386-20110621-1821-nanobsd.img.gz
22-Jun-2011 19:21 	133M	 
[ ]	pfSense-2.0-RC3-2g-i386-20110621-1821-nanobsd.img.gz
22-Jun-2011 19:21 	130M	 
[ ]	pfSense-2.0-RC3-1g-i386-20110621-1821-nanobsd.img.gz
22-Jun-2011 19:20 	128M	 
[ ]	pfSense-2.0-RC3-512mb-i386-20110621-1821-nanobsd.img.gz	22-Jun-2011
19:21 	128M	 
[ ]	pfSense-memstick-2.0-RC3-amd64-20110621-2308.img.gz
22-Jun-2011 19:17 	110M	 
[ ]	pfSense-2.0-RC3-amd64-20110621-2308.iso.gz	      	22-Jun-2011
19:17 	110M	

Thanks 
Guru