There should be a '-'; it should be "-forcegpu ati_r700" (without the "s).
And HFM is similar to Fahmon, except for -bigadv WU and SMP2 WUs (the ones with bonus points), HFM includes bonus calculations in its PPD, while Fahmon doesn't.
And HFM is similar to Fahmon, except for -bigadv WU and SMP2 WUs (the ones with bonus points), HFM includes bonus calculations in its PPD, while Fahmon doesn't.










