I'm building a windows 8 computer. I have a hd 7770 already and I have two options. Buy another 7770 but use a g630 processor. Or get an I5 instead. Would 7770 crossfire be bottlenecked by g630? What would you rather get?
I don't think that it would bottlneck. If it does you could get the 7770, and then when you get enough money buy a new cpu, if there is a bottleneck. The problem is, it is really hard to tell if something will bottleneck without owning it first.
What resolution you using?
Without knowing your system specs, I would recommend upgrading the cpu now and save up for a better once card gpu solution. At some point very soon you will be wanting to upgrade both the cpu and 7770 X 2 I feel.