Tried 64 bit RC3 netinst on an 8 GB e6550 machine. After formatting the HD Anaconda barfed on a conflict of hd and texlive.
On an Asus p8z77-vlePlus UEFI boot Anaconda was unable to allocate disk space, same as RC1 and RC2.
Booting without UEFI Anaconda was able to allocate disk space but exhausted its list of download mirrors.
One might want to wait for RC4 or later.