Fps drop when recording with Fraps/Bandicam

My FPS is usually at 200+ when I play crossfire, but as soon as I start recording I get like 40-20 fps. When I stop recording Crossfire crashes.
I can record Far cry 3, CS:GO, BF4 and other high graphic games and I get 80-140 FPS.
This problem seems to be with Crossfire only. I reinstalled Crossfire, but it didnt work.
Crossfire is not blocked in any antivirus or firewall.
Any help?
Specs:
-8 gb RAM
-AMD Radeon HD 1800-series Video card
- Intel i3-3220 3.30 GHz CPU
- Windows 7 Home premium 64 bit OS

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