Upgrading from RH 7.0+bits to fairfax, I met the "Add swap" dialogue box in the text mode install. It tells you that you'll need more swap, and the "twice the RAM" formula. It tells you how much swap you currently have. It doesn't tell you how much RAM (it thinks) you have. I realise that many people know this kind of stuff, but when it's one of about half a dozen machines or when you really don't know anything about your computer, it's easy to get muddled. If there is room for this, "Found: this amount of RAM (may be wrong of course..)" gives people an idea of whether they should be adding swap.
Fixed.