High Cpu usage when running crossfire

Alright well.. When ever i run crossfire my cpu usage goes up to about 70% and with ventrilo and music going its about 90% and its lagging and the sound bugs in and out.. Anyone know if this is normal or is there something to fix it?

Computer Specs

OS:Windows vista 32bit

Prossecer:Intel (R) Pentium(R) D CPU 2.80 GHz.

Ram: 2gb

Video card:Nvidia Geforce 9500 GT

If you know anything that lowers it please let me know.

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