I've heard various things about the Minecraft version Feed the Beast runs. Some people say it runs 1.5.1, others say it runs 1.4.7. Others still say it supports the features of 1.4.7, as if to imply it's actually an older version with mods that emulate the new features of 1.4.7 (not excluding all the mods' other features, of course).
Can anyone clarify which version FTB actually runs? If it is indeed 1.4.7 or later, how is that achieved? IndustrialCraft, RedPower, and perhaps other included mods do not support those newer MC versions, as far as I can tell. So how would FTB make that version work?
I realize that there are multiple modpacks under the FTB banner. But a lot of them seem to include some combination of the big, popular mods like IndustrialCraft and Redpower. These are the ones I'm speaking of.
On a related note, if I wanted to install a lot of the mods in FTB, but not actually use FTB, would you recommend a particular Minecraft version? I.e. is there a certain lowest-common-denominator version of MC that's recommended for compatibility with all the big mods in FTB?