I have a AMD radeon 6670, it has a display port, DVI-I and a VGA output. I have 2 VGA monitors with no other ports.
Is it possible to connect two VGA cables to this with an adapter and will the card support 2 VGA outputs?
Given the choice between an expensive convertor or a cheap mere plug style convertor I would do for a DVI-I to VGA plug.
Mind you, VGA is old (1985-ish). It was replaced by DVI.
DVI is old, it has been replaced by DHMI and DP.
So if you want to add a third monitor in the future then consider a DP port monitor (or whatever is relevant at that time) rather than using 28 year old standard*.
*VGA was introduced in 1987. Today it is 2015. That is 28 years!
Hook the VGA output to one monitor. Use an adapter to convert DisplayPort to VGA, and use that to connect the other monitor.