Protools Hd 7 Weak! Options

[elipio]

Heya fellow artists,
I've just upgraded from MIX 24 to HD1.
I was supposed to have 4 times the DSP power, but today while mixing I used 7 plugins and it said NO to the 8th one....
I was using the 32 voices (1dsp) setting. When I switched to 16 voices it still didn't allow for additional plugins ( it always helped when I had MIX 24. The fewer voices the more availavle plugin power...

I guess because I'm not familiar with Protools 7HD I'm missing something...

I looked up the manual but it didn't explain how to manage DSP power...

PLEASE!!!! HELP!!!!!

Thanks

Pete