2 axe fx would do it. I run out of processor too, I have started using 2 amps in my chain with a modifier to mute one or the other. After I add reverbs delays, stomp boxes, etc, I run out of processor if I run the 2 cabs in HiRes. So I run them in Low Res. It matters which effects or which amp models you pull up. Some of them are really processor intense, more so than some others. Sometimes, you can choose wrong and you've chosen all of the most labor intensive reverbs and delays, or amps, and you'll get an overload warning. If you still keep reverbs and delays, but you switch to less detailed ones, the CPU usage goes back down into acceptable levels.
If I had a 2nd Axe II, I would remove the cabs all together from the first axe, which would allow for many more effects. I would run the first Axe into the second and use the 2nd one for the Cabs and additional effects, or looper, whatever.
Note also, that I am using the Effects Loop in my Axe, which is another effect block that sucks CPU. If I had 2 Fractals, I would probably just have my extra gadgets in the audio path between the 2 units, thereby freeing up even more CPU in the first Fractal unit.
Whoops - sounds like I just talked myself into a 2nd Fractal unit......
