2012 iMac i7 with hyperthreading takes 20+ minutes to render a 17gb raw file into h264 with Avidemux. My A10-5800K quad core at stock settings takes 10 minutes. The i7 should be destroy the AMD apu. I haven't read about this problem anywhere else. Maybe Avidemux has problems with hyperthreading? There is no bios and I don't think you can turn it off in EFI.