I'd have thought probably true.
Tom's saying you aren't going to be able to have games on max settings.
Even with Crossfire, vRAM may be a small issue too.
You should be fine running games in medium settings. Some games on high even - But I doubt you'll see many games where you're able to put all settings on ultra and get 60FPS...
On my single 670, on BF3 with settings on ultra, I get around 30FPS which isn't really playable. But if I take the settings down to medium, the FPS doesn't drop below 60.
It's your decision - but most people tend to favour a high end single card, over 2 mid-range cards in Crossfire.
Also - don't double post