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As high as supported by the audio chip DSP unit. Some support 16bit 48kHz, some 24bit 96kHz, my AE-5 supports 32bit 96kHz. There is a catch though. My soundcard supports 32bit 384kHz, but only as passthrough, so the audio basically goes straight through the chip directly to speakers. If I want DSP to process them, I need to use 32bit 96kHz.
If your specs are correct, I'd say 16bit 48kHz is what you'll probably be able to use with your system (assuming you're using onboard audio).